diff --git a/server/api/me/export/request.post.ts b/server/api/me/export/request.post.ts
new file mode 100644
index 0000000..8501581
--- /dev/null
+++ b/server/api/me/export/request.post.ts
@@ -0,0 +1,18 @@
+import { createExportTask } from "#server/service/export/jobs";
+import { runExportTask } from "#server/service/export/run";
+import { parseMeExportRequestBody } from "#server/utils/me-export-request-body";
+import { R } from "#server/utils/response";
+
+export default defineWrappedResponseHandler(async (event) => {
+  const user = await event.context.auth.requireUser();
+  const body = await readBody(event);
+  const { maskPolicy } = parseMeExportRequestBody(body);
+  const task = await createExportTask({ userId: user.id, maskPolicy });
+  void runExportTask(task.id).catch(() => {
+    // 后台执行失败会在任务状态中可见，此处不影响请求返回。
+  });
+  return R.success({
+    taskId: task.id,
+    status: task.status,
+  });
+});
diff --git a/server/api/me/export/tasks.get.ts b/server/api/me/export/tasks.get.ts
new file mode 100644
index 0000000..74e422b
--- /dev/null
+++ b/server/api/me/export/tasks.get.ts
@@ -0,0 +1,21 @@
+import { listExportTasksByUser } from "#server/service/export/jobs";
+import { R } from "#server/utils/response";
+
+export default defineWrappedResponseHandler(async (event) => {
+  const user = await event.context.auth.requireUser();
+  const tasks = await listExportTasksByUser(user.id);
+  return R.success({
+    items: tasks.map((task) => ({
+      id: task.id,
+      status: task.status,
+      maskPolicy: task.maskPolicy,
+      outputName: task.outputName,
+      totalBytes: task.totalBytes,
+      errorCode: task.errorCode,
+      errorMessage: task.errorMessage,
+      createdAt: task.createdAt.toISOString(),
+      updatedAt: task.updatedAt.toISOString(),
+      expiresAt: task.expiresAt ? task.expiresAt.toISOString() : null,
+    })),
+  });
+});
diff --git a/server/api/me/export/tasks/[id]/download.get.ts b/server/api/me/export/tasks/[id]/download.get.ts
new file mode 100644
index 0000000..3937a15
--- /dev/null
+++ b/server/api/me/export/tasks/[id]/download.get.ts
@@ -0,0 +1,36 @@
+import fs from "node:fs";
+import path from "node:path";
+import { sendStream, setHeader } from "h3";
+import { getExportTaskForUser } from "#server/service/export/jobs";
+
+export default defineWrappedResponseHandler(async (event) => {
+  const user = await event.context.auth.requireUser();
+  const idRaw = getRouterParam(event, "id");
+  const taskId = Number(idRaw);
+  if (!Number.isInteger(taskId) || taskId < 1) {
+    throw createError({ statusCode: 400, statusMessage: "无效的任务 id" });
+  }
+
+  const task = await getExportTaskForUser(taskId, user.id);
+  if (!task) {
+    throw createError({ statusCode: 404, statusMessage: "导出任务不存在" });
+  }
+  if (task.status !== "succeeded") {
+    throw createError({ statusCode: 409, statusMessage: "导出任务尚未完成" });
+  }
+  if (!task.expiresAt || task.expiresAt.getTime() <= Date.now()) {
+    throw createError({ statusCode: 410, statusMessage: "导出结果已过期" });
+  }
+  if (!task.outputDir || !task.outputName) {
+    throw createError({ statusCode: 500, statusMessage: "导出结果缺失" });
+  }
+
+  const manifestPath = path.resolve(task.outputDir, "manifest.json");
+  if (!fs.existsSync(manifestPath)) {
+    throw createError({ statusCode: 404, statusMessage: "导出文件不存在" });
+  }
+
+  setHeader(event, "Content-Type", "application/json; charset=utf-8");
+  setHeader(event, "Content-Disposition", `attachment; filename="${task.outputName}-manifest.json"`);
+  return sendStream(event, fs.createReadStream(manifestPath));
+});
diff --git a/server/constants/export.ts b/server/constants/export.ts
new file mode 100644
index 0000000..6322906
--- /dev/null
+++ b/server/constants/export.ts
@@ -0,0 +1,25 @@
+export const EXPORT_MASK_POLICIES = ["masked", "raw"] as const;
+
+export type ExportMaskPolicy = (typeof EXPORT_MASK_POLICIES)[number];
+
+/**
+ * 标准化后（小写并移除 `_` / `-`）的永不导出字段精确匹配名单。
+ */
+export const NEVER_EXPORT_FIELD_EXACT_NAMES = [
+  "password",
+  "passwordhash",
+  "resettoken",
+  "resetpasswordtoken",
+  "sessionid",
+  "sessiontoken",
+  "accesstoken",
+  "refreshtoken",
+  "apikey",
+  "secretkey",
+  "credential",
+] as const;
+
+/**
+ * masked 策略下优先脱敏的字段关键词（可扩展）。
+ */
+export const DEFAULT_MASK_FIELD_KEYWORDS = ["email", "phone", "mobile"] as const;
diff --git a/server/service/export/build-data.ts b/server/service/export/build-data.ts
new file mode 100644
index 0000000..7165a56
--- /dev/null
+++ b/server/service/export/build-data.ts
@@ -0,0 +1,113 @@
+import fs from "node:fs/promises";
+import path from "node:path";
+import { dbGlobal } from "drizzle-pkg/lib/db";
+import { users } from "drizzle-pkg/lib/schema/auth";
+import { userConfigs } from "drizzle-pkg/lib/schema/config";
+import { mediaAssets, mediaRefs, postComments, posts, timelineEvents } from "drizzle-pkg/lib/schema/content";
+import { and, eq, inArray, lte, or } from "drizzle-orm";
+import { MEDIA_REF_OWNER_POST } from "../../constants/media-refs";
+import type { ExportMaskPolicy } from "../../constants/export";
+import { sanitizeUserForExport } from "../../utils/export-mask";
+
+export type BuildExportDataResult = {
+  dataFiles: Array<{ file: string; rowCount: number }>;
+  totalRows: number;
+};
+
+async function writeDataFile(baseDir: string, fileName: string, payload: unknown): Promise<{ file: string; rowCount: number }> {
+  const file = `data/${fileName}`;
+  const fullPath = path.resolve(baseDir, fileName);
+  await fs.writeFile(fullPath, `${JSON.stringify(payload, null, 2)}\n`, "utf8");
+  const rowCount = Array.isArray(payload) ? payload.length : payload ? 1 : 0;
+  return { file, rowCount };
+}
+
+export async function buildExportDataJson(params: {
+  userId: number;
+  maskPolicy: ExportMaskPolicy;
+  cutoffAt: Date;
+  outputDataDir: string;
+}): Promise<BuildExportDataResult> {
+  await fs.mkdir(params.outputDataDir, { recursive: true });
+
+  const [userRow] = await dbGlobal.select().from(users).where(eq(users.id, params.userId)).limit(1);
+  if (!userRow) {
+    throw new Error(`user not found: ${params.userId}`);
+  }
+
+  const sanitizedUser = sanitizeUserForExport(userRow as unknown as Record<string, unknown>, params.maskPolicy);
+
+  const [postRows, timelineRows, mediaRows, configRows] = await Promise.all([
+    dbGlobal
+      .select()
+      .from(posts)
+      .where(and(eq(posts.userId, params.userId), lte(posts.createdAt, params.cutoffAt))),
+    dbGlobal
+      .select()
+      .from(timelineEvents)
+      .where(and(eq(timelineEvents.userId, params.userId), lte(timelineEvents.createdAt, params.cutoffAt))),
+    dbGlobal
+      .select()
+      .from(mediaAssets)
+      .where(and(eq(mediaAssets.userId, params.userId), lte(mediaAssets.createdAt, params.cutoffAt))),
+    dbGlobal
+      .select()
+      .from(userConfigs)
+      .where(and(eq(userConfigs.userId, params.userId), lte(userConfigs.updatedAt, params.cutoffAt))),
+  ]);
+
+  const postIds = postRows.map((p) => p.id);
+  const commentCondition =
+    postIds.length === 0
+      ? and(lte(postComments.createdAt, params.cutoffAt), eq(postComments.authorUserId, params.userId))
+      : and(
+          lte(postComments.createdAt, params.cutoffAt),
+          or(eq(postComments.authorUserId, params.userId), inArray(postComments.postId, postIds)),
+        );
+  const commentRowsRaw = await dbGlobal.select().from(postComments).where(commentCondition);
+
+  const mediaRefRows =
+    postIds.length === 0
+      ? []
+      : await dbGlobal
+          .select()
+          .from(mediaRefs)
+          .where(and(eq(mediaRefs.ownerType, MEDIA_REF_OWNER_POST), inArray(mediaRefs.ownerId, postIds)));
+  const commentRows = commentRowsRaw.map((row) =>
+    params.maskPolicy === "masked"
+      ? sanitizeUserForExport(row as unknown as Record<string, unknown>, params.maskPolicy)
+      : row,
+  );
+  const configRowsMasked = configRows.map((row) =>
+    params.maskPolicy === "masked"
+      ? sanitizeUserForExport(row as unknown as Record<string, unknown>, params.maskPolicy)
+      : row,
+  );
+
+  const dataFiles = await Promise.all([
+    writeDataFile(params.outputDataDir, "user.json", sanitizedUser),
+    writeDataFile(params.outputDataDir, "posts.json", postRows),
+    writeDataFile(params.outputDataDir, "timeline.json", timelineRows),
+    writeDataFile(params.outputDataDir, "comments.json", commentRows),
+    writeDataFile(params.outputDataDir, "media-assets.json", mediaRows),
+    writeDataFile(params.outputDataDir, "media-refs.json", mediaRefRows),
+    writeDataFile(params.outputDataDir, "user-configs.json", configRowsMasked),
+  ]);
+
+  const totalRows = dataFiles.reduce((sum, item) => sum + item.rowCount, 0);
+
+  return { dataFiles, totalRows };
+}
+
+export async function listExportUserMediaAssets(params: {
+  userId: number;
+  cutoffAt: Date;
+}): Promise<Array<{ storageKey: string }>> {
+  const rows = await dbGlobal
+    .select({
+      storageKey: mediaAssets.storageKey,
+    })
+    .from(mediaAssets)
+    .where(and(eq(mediaAssets.userId, params.userId), lte(mediaAssets.createdAt, params.cutoffAt)));
+  return rows;
+}
diff --git a/server/service/export/build-files.ts b/server/service/export/build-files.ts
new file mode 100644
index 0000000..4b01be3
--- /dev/null
+++ b/server/service/export/build-files.ts
@@ -0,0 +1,63 @@
+import fs from "node:fs/promises";
+import path from "node:path";
+import { RELATIVE_ASSETS_DIR } from "../../constants/media";
+import { listExportUserMediaAssets } from "./build-data";
+
+type ExportFileAsset = {
+  storageKey: string;
+};
+
+export type BuildExportFilesResult = {
+  files: Array<{ file: string; bytes: number }>;
+  missingCount: number;
+};
+
+function resolveAssetsBaseDir(): string {
+  return path.resolve(process.cwd(), RELATIVE_ASSETS_DIR);
+}
+
+export async function buildExportMediaFiles(params: {
+  userId: number;
+  cutoffAt: Date;
+  outputFilesDir: string;
+}): Promise<BuildExportFilesResult> {
+  await fs.mkdir(params.outputFilesDir, { recursive: true });
+
+  const mediaAssets: ExportFileAsset[] = await listExportUserMediaAssets({
+    userId: params.userId,
+    cutoffAt: params.cutoffAt,
+  });
+  const assetsBaseDir = resolveAssetsBaseDir();
+  let missingCount = 0;
+  const files: Array<{ file: string; bytes: number }> = [];
+
+  for (const asset of mediaAssets) {
+    const key = asset.storageKey;
+    if (!key || key.includes("..") || path.isAbsolute(key)) {
+      missingCount += 1;
+      continue;
+    }
+
+    const fromPath = path.resolve(assetsBaseDir, key);
+    const toPath = path.resolve(params.outputFilesDir, key);
+    const relativeOutputPath = `files/${key}`;
+    await fs.mkdir(path.dirname(toPath), { recursive: true });
+
+    try {
+      await fs.copyFile(fromPath, toPath);
+      const stat = await fs.stat(toPath);
+      files.push({ file: relativeOutputPath, bytes: stat.size });
+    } catch (error) {
+      if ((error as NodeJS.ErrnoException).code === "ENOENT") {
+        missingCount += 1;
+        continue;
+      }
+      throw error;
+    }
+  }
+
+  return {
+    files,
+    missingCount,
+  };
+}
diff --git a/server/service/export/build-manifest.test.ts b/server/service/export/build-manifest.test.ts
new file mode 100644
index 0000000..29cadf1
--- /dev/null
+++ b/server/service/export/build-manifest.test.ts
@@ -0,0 +1,47 @@
+import { describe, expect, test } from "bun:test";
+import { buildExportManifest } from "./build-manifest";
+
+describe("buildExportManifest", () => {
+  test("builds manifest with required fields and checksums", () => {
+    const exportedAt = new Date("2026-04-24T10:00:00.000Z");
+    const cutoffAt = new Date("2026-04-24T09:00:00.000Z");
+
+    const manifest = buildExportManifest({
+      schemaVersion: 1,
+      userId: 123,
+      maskPolicy: "masked",
+      exportedAt,
+      exportCutoffAt: cutoffAt,
+      stats: {
+        dataRows: 10,
+        files: 1,
+        bytes: 1024,
+      },
+      dataChecksums: [
+        { file: "data/user.json", sha256: "sha256-user" },
+        { file: "data/media-assets.json", sha256: "sha256-media" },
+      ],
+      fileChecksums: [{ file: "files/a.webp", sha256: "sha256-file-a" }],
+    });
+
+    expect(manifest).toEqual({
+      schemaVersion: 1,
+      exportedAt: exportedAt.toISOString(),
+      exportCutoffAt: cutoffAt.toISOString(),
+      userId: 123,
+      maskPolicy: "masked",
+      stats: {
+        dataRows: 10,
+        files: 1,
+        bytes: 1024,
+      },
+      checksums: {
+        data: [
+          { file: "data/user.json", sha256: "sha256-user" },
+          { file: "data/media-assets.json", sha256: "sha256-media" },
+        ],
+        files: [{ file: "files/a.webp", sha256: "sha256-file-a" }],
+      },
+    });
+  });
+});
diff --git a/server/service/export/build-manifest.ts b/server/service/export/build-manifest.ts
new file mode 100644
index 0000000..3effb2c
--- /dev/null
+++ b/server/service/export/build-manifest.ts
@@ -0,0 +1,44 @@
+import type { ExportMaskPolicy } from "../../constants/export";
+
+type ExportManifestStats = {
+  dataRows: number;
+  files: number;
+  bytes: number;
+};
+
+export type ExportManifest = {
+  schemaVersion: number;
+  exportedAt: string;
+  exportCutoffAt: string;
+  userId: number;
+  maskPolicy: ExportMaskPolicy;
+  stats: ExportManifestStats;
+  checksums: {
+    data: Array<{ file: string; sha256: string }>;
+    files: Array<{ file: string; sha256: string }>;
+  };
+};
+
+export function buildExportManifest(params: {
+  schemaVersion: number;
+  userId: number;
+  maskPolicy: ExportMaskPolicy;
+  exportedAt: Date;
+  exportCutoffAt: Date;
+  stats: ExportManifestStats;
+  dataChecksums: Array<{ file: string; sha256: string }>;
+  fileChecksums: Array<{ file: string; sha256: string }>;
+}): ExportManifest {
+  return {
+    schemaVersion: params.schemaVersion,
+    exportedAt: params.exportedAt.toISOString(),
+    exportCutoffAt: params.exportCutoffAt.toISOString(),
+    userId: params.userId,
+    maskPolicy: params.maskPolicy,
+    stats: params.stats,
+    checksums: {
+      data: params.dataChecksums,
+      files: params.fileChecksums,
+    },
+  };
+}
diff --git a/server/service/export/jobs.test.ts b/server/service/export/jobs.test.ts
new file mode 100644
index 0000000..347ddd2
--- /dev/null
+++ b/server/service/export/jobs.test.ts
@@ -0,0 +1,153 @@
+import { beforeAll, beforeEach, describe, expect, mock, test } from "bun:test";
+import { eq, inArray } from "drizzle-orm";
+
+process.env.DATABASE_URL ??= "file:./packages/drizzle-pkg/db.sqlite";
+
+const { dbGlobal } = await import("drizzle-pkg/database/sqlite/db-bun");
+mock.module("drizzle-pkg/lib/db", () => ({ dbGlobal }));
+
+const { users } = await import("drizzle-pkg/lib/schema/auth");
+const { userExportTasks } = await import("drizzle-pkg/lib/schema/export");
+const {
+  claimNextQueuedTask,
+  createExportTask,
+  getExportTaskForUser,
+  listExportTasksByUser,
+  markExportTaskFailed,
+  markExportTaskRunning,
+  markExportTaskSucceeded,
+} = await import("./jobs");
+
+const USER_1 = { id: 910001, username: "export_jobs_u1", password: "pw1" };
+const USER_2 = { id: 910002, username: "export_jobs_u2", password: "pw2" };
+const TEST_USERS: Array<{ id: number; username: string; password: string }> = [USER_1, USER_2];
+
+async function resetRows() {
+  const ids = [USER_1.id, USER_2.id];
+  await dbGlobal.delete(userExportTasks).where(inArray(userExportTasks.userId, ids));
+  await dbGlobal.delete(users).where(inArray(users.id, ids));
+}
+
+describe("export jobs service", () => {
+  beforeAll(async () => {
+    await resetRows();
+  });
+
+  beforeEach(async () => {
+    await resetRows();
+    await dbGlobal.insert(users).values(TEST_USERS);
+  });
+
+  test("createExportTask creates queued task with given policy", async () => {
+    const task = await createExportTask({ userId: USER_1.id, maskPolicy: "masked" });
+
+    expect(task).toBeTruthy();
+    expect(task.userId).toBe(USER_1.id);
+    expect(task.status).toBe("queued");
+    expect(task.maskPolicy).toBe("masked");
+    expect(task.exportCutoffAt).toBeNull();
+  });
+
+  test("markExportTaskRunning writes exportCutoffAt timestamp", async () => {
+    const task = await createExportTask({ userId: USER_1.id, maskPolicy: "raw" });
+
+    const running = await markExportTaskRunning(task.id);
+    expect(running).toBeTruthy();
+    expect(running?.status).toBe("running");
+    expect(running?.exportCutoffAt).toBeInstanceOf(Date);
+
+    const [fromDb] = await dbGlobal
+      .select()
+      .from(userExportTasks)
+      .where(eq(userExportTasks.id, task.id))
+      .limit(1);
+    expect(fromDb?.exportCutoffAt).toBeInstanceOf(Date);
+  });
+
+  test("listExportTasksByUser only returns the requested user tasks", async () => {
+    const firstU1 = await createExportTask({ userId: USER_1.id, maskPolicy: "masked" });
+    await markExportTaskRunning(firstU1.id);
+    await markExportTaskSucceeded(firstU1.id, {
+      outputDir: "/tmp/export-u1-1",
+      outputName: "export-u1-1.zip",
+      totalBytes: 128,
+      expiresAt: new Date("2026-04-24T00:00:00.000Z"),
+    });
+    await createExportTask({ userId: USER_2.id, maskPolicy: "raw" });
+    await createExportTask({ userId: USER_1.id, maskPolicy: "raw" });
+
+    const rows = await listExportTasksByUser(USER_1.id);
+    expect(rows.length).toBe(2);
+    expect(rows.every((row) => row.userId === USER_1.id)).toBe(true);
+    expect(rows[0]!.id).toBeGreaterThan(rows[1]!.id);
+  });
+
+  test("markExportTaskSucceeded and markExportTaskFailed persist payload fields", async () => {
+    const task1 = await createExportTask({ userId: USER_1.id, maskPolicy: "masked" });
+    await markExportTaskRunning(task1.id);
+
+    await markExportTaskSucceeded(task1.id, {
+      outputDir: "/tmp/export-1",
+      outputName: "export-1.zip",
+      totalBytes: 1234,
+      expiresAt: new Date("2026-04-24T00:00:00.000Z"),
+    });
+    const task2 = await createExportTask({ userId: USER_1.id, maskPolicy: "raw" });
+    await markExportTaskRunning(task2.id);
+    await markExportTaskFailed(task2.id, {
+      errorCode: "EXPORT_IO",
+      errorMessage: "disk full",
+    });
+
+    const row1 = await getExportTaskForUser(task1.id, USER_1.id);
+    const row2 = await getExportTaskForUser(task2.id, USER_1.id);
+    expect(row1?.status).toBe("succeeded");
+    expect(row1?.outputName).toBe("export-1.zip");
+    expect(row2?.status).toBe("failed");
+    expect(row2?.errorCode).toBe("EXPORT_IO");
+  });
+
+  test("invalid status transition is rejected", async () => {
+    const task = await createExportTask({ userId: USER_1.id, maskPolicy: "masked" });
+    await expect(
+      markExportTaskSucceeded(task.id, {
+        outputDir: "/tmp/export-invalid",
+        outputName: "export-invalid.zip",
+        totalBytes: 1,
+        expiresAt: new Date("2026-04-24T00:00:00.000Z"),
+      }),
+    ).rejects.toThrow("invalid export task transition");
+  });
+
+  test("getExportTaskForUser enforces ownership", async () => {
+    const task = await createExportTask({ userId: USER_1.id, maskPolicy: "masked" });
+
+    const own = await getExportTaskForUser(task.id, USER_1.id);
+    const other = await getExportTaskForUser(task.id, USER_2.id);
+    expect(own?.id).toBe(task.id);
+    expect(other).toBeNull();
+  });
+
+  test("claimNextQueuedTask returns null when no queued task", async () => {
+    const task = await claimNextQueuedTask();
+    expect(task).toBeNull();
+  });
+
+  test("claimNextQueuedTask claims the earliest queued task once", async () => {
+    const first = await createExportTask({ userId: USER_1.id, maskPolicy: "masked" });
+    await createExportTask({ userId: USER_2.id, maskPolicy: "raw" });
+
+    const claimed = await claimNextQueuedTask();
+    const nextClaimed = await claimNextQueuedTask();
+    expect(claimed?.id).toBe(first.id);
+    expect(claimed?.status).toBe("running");
+    expect(nextClaimed?.id).not.toBe(first.id);
+  });
+
+  test("createExportTask rejects when user already has active task", async () => {
+    await createExportTask({ userId: USER_1.id, maskPolicy: "masked" });
+    await expect(createExportTask({ userId: USER_1.id, maskPolicy: "raw" })).rejects.toMatchObject({
+      statusCode: 409,
+    });
+  });
+});
diff --git a/server/service/export/jobs.ts b/server/service/export/jobs.ts
new file mode 100644
index 0000000..f7cbceb
--- /dev/null
+++ b/server/service/export/jobs.ts
@@ -0,0 +1,155 @@
+import { dbGlobal } from "drizzle-pkg/lib/db";
+import { userExportTasks } from "drizzle-pkg/lib/schema/export";
+import { and, desc, eq, or } from "drizzle-orm";
+import { createError } from "h3";
+import { nextIntegerId } from "../../utils/sqlite-id";
+
+type ExportMaskPolicy = "masked" | "raw";
+
+async function getExportTaskById(taskId: number) {
+  const [row] = await dbGlobal
+    .select()
+    .from(userExportTasks)
+    .where(eq(userExportTasks.id, taskId))
+    .limit(1);
+  return row ?? null;
+}
+
+async function getRequiredExportTaskById(taskId: number) {
+  const row = await getExportTaskById(taskId);
+  if (!row) {
+    throw new Error(`export task not found: ${taskId}`);
+  }
+  return row;
+}
+
+export async function createExportTask(params: { userId: number; maskPolicy: ExportMaskPolicy }) {
+  const [activeTask] = await dbGlobal
+    .select({ id: userExportTasks.id })
+    .from(userExportTasks)
+    .where(
+      and(
+        eq(userExportTasks.userId, params.userId),
+        or(eq(userExportTasks.status, "queued"), eq(userExportTasks.status, "running")),
+      ),
+    )
+    .limit(1);
+  if (activeTask) {
+    throw createError({ statusCode: 409, statusMessage: "已有导出任务在处理中，请稍后再试" });
+  }
+  const id = await nextIntegerId(userExportTasks, userExportTasks.id);
+  await dbGlobal.insert(userExportTasks).values({
+    id,
+    userId: params.userId,
+    maskPolicy: params.maskPolicy,
+    status: "queued",
+  });
+  return getRequiredExportTaskById(id);
+}
+
+export async function listExportTasksByUser(userId: number) {
+  return dbGlobal
+    .select()
+    .from(userExportTasks)
+    .where(eq(userExportTasks.userId, userId))
+    .orderBy(desc(userExportTasks.id));
+}
+
+export async function markExportTaskRunning(taskId: number) {
+  const cutoffAt = new Date();
+  await dbGlobal
+    .update(userExportTasks)
+    .set({
+      status: "running",
+      exportCutoffAt: cutoffAt,
+    })
+    .where(and(eq(userExportTasks.id, taskId), eq(userExportTasks.status, "queued")));
+  const row = await getRequiredExportTaskById(taskId);
+  if (row.status !== "running" || row.exportCutoffAt?.getTime() !== cutoffAt.getTime()) {
+    throw new Error(`invalid export task transition for ${taskId}: expected queued -> running`);
+  }
+  return row;
+}
+
+export async function claimNextQueuedTask() {
+  for (let i = 0; i < 5; i += 1) {
+    const [queued] = await dbGlobal
+      .select({ id: userExportTasks.id })
+      .from(userExportTasks)
+      .where(eq(userExportTasks.status, "queued"))
+      .orderBy(userExportTasks.id)
+      .limit(1);
+    if (!queued) {
+      return null;
+    }
+
+    try {
+      return await markExportTaskRunning(queued.id);
+    } catch (error) {
+      const message = error instanceof Error ? error.message : "";
+      if (!message.includes("invalid export task transition")) {
+        throw error;
+      }
+    }
+  }
+  return null;
+}
+
+export async function markExportTaskSucceeded(
+  taskId: number,
+  payload: {
+    outputDir: string;
+    outputName: string;
+    totalBytes: number;
+    expiresAt: Date;
+  },
+) {
+  await dbGlobal
+    .update(userExportTasks)
+    .set({
+      status: "succeeded",
+      outputDir: payload.outputDir,
+      outputName: payload.outputName,
+      totalBytes: payload.totalBytes,
+      expiresAt: payload.expiresAt,
+      errorCode: null,
+      errorMessage: null,
+    })
+    .where(and(eq(userExportTasks.id, taskId), eq(userExportTasks.status, "running")));
+  const row = await getRequiredExportTaskById(taskId);
+  if (row.status !== "succeeded") {
+    throw new Error(`invalid export task transition for ${taskId}: expected running -> succeeded`);
+  }
+  return row;
+}
+
+export async function markExportTaskFailed(
+  taskId: number,
+  payload: {
+    errorCode: string;
+    errorMessage: string;
+  },
+) {
+  await dbGlobal
+    .update(userExportTasks)
+    .set({
+      status: "failed",
+      errorCode: payload.errorCode,
+      errorMessage: payload.errorMessage,
+    })
+    .where(and(eq(userExportTasks.id, taskId), eq(userExportTasks.status, "running")));
+  const row = await getRequiredExportTaskById(taskId);
+  if (row.status !== "failed") {
+    throw new Error(`invalid export task transition for ${taskId}: expected running -> failed`);
+  }
+  return row;
+}
+
+export async function getExportTaskForUser(taskId: number, userId: number) {
+  const [row] = await dbGlobal
+    .select()
+    .from(userExportTasks)
+    .where(and(eq(userExportTasks.id, taskId), eq(userExportTasks.userId, userId)))
+    .limit(1);
+  return row ?? null;
+}
diff --git a/server/service/export/run.ts b/server/service/export/run.ts
new file mode 100644
index 0000000..fba9fa7
--- /dev/null
+++ b/server/service/export/run.ts
@@ -0,0 +1,103 @@
+import fs from "node:fs/promises";
+import path from "node:path";
+import { buildExportDataJson } from "#server/service/export/build-data";
+import { buildExportMediaFiles } from "#server/service/export/build-files";
+import { buildExportManifest } from "#server/service/export/build-manifest";
+import {
+  markExportTaskFailed,
+  markExportTaskRunning,
+  markExportTaskSucceeded,
+} from "#server/service/export/jobs";
+import { sha256File } from "#server/utils/export-hash";
+
+const EXPORT_RESULT_TTL_MS = 24 * 60 * 60 * 1000;
+
+function resolveExportRootDir() {
+  return path.resolve(process.cwd(), ".tmp", "exports");
+}
+
+async function calcChecksums(baseDir: string, files: Array<{ file: string }>) {
+  return Promise.all(
+    files.map(async (item) => ({
+      file: item.file,
+      sha256: await sha256File(path.resolve(baseDir, item.file)),
+    })),
+  );
+}
+
+export async function runExportTask(taskId: number) {
+  const runningTask = await markExportTaskRunning(taskId);
+  return runExportTaskWithRunning(taskId, runningTask);
+}
+
+export async function runExportTaskWithRunning(
+  taskId: number,
+  runningTask: Awaited<ReturnType<typeof markExportTaskRunning>>,
+) {
+  const cutoffAt = runningTask.exportCutoffAt ?? new Date();
+  const exportRootDir = resolveExportRootDir();
+  const outputName = `export-task-${taskId}`;
+  const outputDir = path.resolve(exportRootDir, outputName);
+  const outputDataDir = path.resolve(outputDir, "data");
+  const outputFilesDir = path.resolve(outputDir, "files");
+
+  try {
+    await fs.mkdir(outputDir, { recursive: true });
+
+    const dataResult = await buildExportDataJson({
+      userId: runningTask.userId,
+      maskPolicy: runningTask.maskPolicy as "masked" | "raw",
+      cutoffAt,
+      outputDataDir,
+    });
+    const filesResult = await buildExportMediaFiles({
+      userId: runningTask.userId,
+      cutoffAt,
+      outputFilesDir,
+    });
+
+    const dataChecksums = await calcChecksums(outputDir, dataResult.dataFiles);
+    const fileChecksums = await calcChecksums(outputDir, filesResult.files);
+    const filesBytes = filesResult.files.reduce((sum, item) => sum + item.bytes, 0);
+
+    const manifest = buildExportManifest({
+      schemaVersion: 1,
+      userId: runningTask.userId,
+      maskPolicy: runningTask.maskPolicy as "masked" | "raw",
+      exportedAt: new Date(),
+      exportCutoffAt: cutoffAt,
+      stats: {
+        dataRows: dataResult.totalRows,
+        files: filesResult.files.length,
+        bytes: filesBytes,
+      },
+      dataChecksums,
+      fileChecksums,
+    });
+
+    const manifestPath = path.resolve(outputDir, "manifest.json");
+    await fs.writeFile(manifestPath, `${JSON.stringify(manifest, null, 2)}\n`, "utf8");
+
+    const dataBytes = await Promise.all(
+      dataResult.dataFiles.map(async (item) => {
+        const stat = await fs.stat(path.resolve(outputDir, item.file));
+        return stat.size;
+      }),
+    );
+    const manifestBytes = (await fs.stat(manifestPath)).size;
+    const totalBytes = dataBytes.reduce((sum, size) => sum + size, 0) + filesBytes + manifestBytes;
+
+    await markExportTaskSucceeded(taskId, {
+      outputDir,
+      outputName,
+      totalBytes,
+      expiresAt: new Date(Date.now() + EXPORT_RESULT_TTL_MS),
+    });
+  } catch (error) {
+    await markExportTaskFailed(taskId, {
+      errorCode: "EXPORT_BUILD_FAILED",
+      errorMessage: error instanceof Error ? error.message : "unknown export error",
+    });
+    throw error;
+  }
+}
diff --git a/server/tasks/export/process.ts b/server/tasks/export/process.ts
new file mode 100644
index 0000000..628b2ce
--- /dev/null
+++ b/server/tasks/export/process.ts
@@ -0,0 +1,17 @@
+import { claimNextQueuedTask } from "#server/service/export/jobs";
+import { runExportTaskWithRunning } from "#server/service/export/run";
+
+export default defineTask({
+  meta: {
+    name: "export:process",
+    description: "Claim and process one queued export task",
+  },
+  async run() {
+    const task = await claimNextQueuedTask();
+    if (!task) {
+      return { result: "skipped: no queued task" };
+    }
+    await runExportTaskWithRunning(task.id, task);
+    return { result: "ok", taskId: task.id };
+  },
+});
diff --git a/server/utils/export-hash.ts b/server/utils/export-hash.ts
new file mode 100644
index 0000000..bb1dbe1
--- /dev/null
+++ b/server/utils/export-hash.ts
@@ -0,0 +1,13 @@
+import fs from "node:fs";
+import { createHash } from "node:crypto";
+
+export async function sha256File(filePath: string): Promise<string> {
+  return new Promise((resolve, reject) => {
+    const hash = createHash("sha256");
+    const stream = fs.createReadStream(filePath);
+
+    stream.on("error", reject);
+    stream.on("data", (chunk) => hash.update(chunk));
+    stream.on("end", () => resolve(hash.digest("hex")));
+  });
+}
diff --git a/server/utils/export-mask.ts b/server/utils/export-mask.ts
new file mode 100644
index 0000000..985a111
--- /dev/null
+++ b/server/utils/export-mask.ts
@@ -0,0 +1,62 @@
+import {
+  DEFAULT_MASK_FIELD_KEYWORDS,
+  NEVER_EXPORT_FIELD_EXACT_NAMES,
+  type ExportMaskPolicy,
+} from "../constants/export";
+
+function hitKeyword(field: string, keywords: readonly string[]): boolean {
+  const name = field.toLowerCase();
+  return keywords.some((k) => name.includes(k.toLowerCase()));
+}
+
+function normalizeFieldName(field: string): string {
+  return field.toLowerCase().replace(/[_-]/g, "");
+}
+
+function shouldNeverExportField(field: string): boolean {
+  const normalizedField = normalizeFieldName(field);
+  return NEVER_EXPORT_FIELD_EXACT_NAMES.includes(
+    normalizedField as (typeof NEVER_EXPORT_FIELD_EXACT_NAMES)[number],
+  );
+}
+
+function shouldMaskField(field: string): boolean {
+  return hitKeyword(field, DEFAULT_MASK_FIELD_KEYWORDS);
+}
+
+function maskValue(value: unknown): unknown {
+  if (value === null || value === undefined) {
+    return value;
+  }
+  if (typeof value === "string") {
+    return "***";
+  }
+  if (typeof value === "number") {
+    return 0;
+  }
+  if (typeof value === "boolean") {
+    return false;
+  }
+  return "[masked]";
+}
+
+export function sanitizeUserForExport(
+  row: Record<string, unknown>,
+  maskPolicy: ExportMaskPolicy,
+): Record<string, unknown> {
+  const out: Record<string, unknown> = {};
+  for (const [field, value] of Object.entries(row)) {
+    if (shouldNeverExportField(field)) {
+      continue;
+    }
+    if (maskPolicy === "masked" && shouldMaskField(field)) {
+      out[field] = maskValue(value);
+      continue;
+    }
+    out[field] = value;
+  }
+  return out;
+}
+
+// Backward-compatible alias used by current tests/callers.
+export const applyExportMask = sanitizeUserForExport;
diff --git a/server/utils/me-export-request-body.test.ts b/server/utils/me-export-request-body.test.ts
new file mode 100644
index 0000000..47f31d1
--- /dev/null
+++ b/server/utils/me-export-request-body.test.ts
@@ -0,0 +1,82 @@
+import { describe, expect, test } from "bun:test";
+
+import { applyExportMask } from "./export-mask";
+import { parseMeExportRequestBody } from "./me-export-request-body";
+
+describe("parseMeExportRequestBody", () => {
+  test("maskPolicy defaults to masked", () => {
+    expect(parseMeExportRequestBody({})).toEqual({ maskPolicy: "masked" });
+    expect(parseMeExportRequestBody({ maskPolicy: undefined })).toEqual({ maskPolicy: "masked" });
+  });
+
+  test("invalid maskPolicy throws 400", () => {
+    try {
+      parseMeExportRequestBody({ maskPolicy: "invalid-policy" });
+      expect.unreachable();
+    } catch (e: unknown) {
+      expect(e).toMatchObject({ statusCode: 400 });
+    }
+  });
+});
+
+describe("applyExportMask", () => {
+  test("never-export fields are excluded", () => {
+    const input = {
+      nickname: "dash",
+      passwordHash: "hash",
+      resetToken: "rst",
+      sessionId: "sid",
+      apiKey: "k",
+      accessToken: "token",
+      tokenCount: 3,
+    };
+
+    expect(applyExportMask(input, "raw")).toEqual({
+      nickname: "dash",
+      tokenCount: 3,
+    });
+  });
+
+  test("never-export fields match case and underscore variants", () => {
+    const input = {
+      nickname: "dash",
+      Access_Token: "token",
+      SESSION_ID: "sid",
+    };
+
+    expect(applyExportMask(input, "raw")).toEqual({
+      nickname: "dash",
+    });
+  });
+
+  test("raw policy still filters resetToken/apiKey and naming variants", () => {
+    const input = {
+      nickname: "dash",
+      resetToken: "rst-1",
+      reset_token: "rst-2",
+      resetPasswordToken: "rst-3",
+      apiKey: "key-1",
+      API_KEY: "key-2",
+      email: "dash@example.com",
+    };
+
+    expect(applyExportMask(input, "raw")).toEqual({
+      nickname: "dash",
+      email: "dash@example.com",
+    });
+  });
+
+  test("masked policy masks email and phone fields", () => {
+    const input = {
+      nickname: "dash",
+      email: "dash@example.com",
+      phone: "13800138000",
+    };
+
+    expect(applyExportMask(input, "masked")).toEqual({
+      nickname: "dash",
+      email: "***",
+      phone: "***",
+    });
+  });
+});
diff --git a/server/utils/me-export-request-body.ts b/server/utils/me-export-request-body.ts
new file mode 100644
index 0000000..d12ded3
--- /dev/null
+++ b/server/utils/me-export-request-body.ts
@@ -0,0 +1,20 @@
+import { EXPORT_MASK_POLICIES, type ExportMaskPolicy } from "../constants/export";
+import { createError } from "h3";
+
+type MeExportRequestBody = {
+  maskPolicy?: unknown;
+};
+
+export function parseMeExportRequestBody(body: unknown): { maskPolicy: ExportMaskPolicy } {
+  const payload = (body && typeof body === "object" ? body : {}) as MeExportRequestBody;
+  const raw = payload.maskPolicy;
+  if (raw === undefined || raw === null || raw === "") {
+    return { maskPolicy: "masked" };
+  }
+
+  if (typeof raw !== "string" || !EXPORT_MASK_POLICIES.includes(raw as ExportMaskPolicy)) {
+    throw createError({ statusCode: 400, statusMessage: "maskPolicy 非法，仅支持 masked|raw" });
+  }
+
+  return { maskPolicy: raw as ExportMaskPolicy };
+}