diff --git a/src/app/api/v1/admin/backups/route.ts b/src/app/api/v1/admin/backups/route.ts
index 5f782e8..53afc07 100644
--- a/src/app/api/v1/admin/backups/route.ts
+++ b/src/app/api/v1/admin/backups/route.ts
@@ -1,14 +1,28 @@
 import { NextRequest } from "next/server";
 import { jsonNoStore } from "@/lib/api-response";
+import { buildRequestAuditMeta } from "@/lib/boss-audit";
 import { requireRequestSession } from "@/lib/boss-auth";
 import { requireCsrfSafeMutation } from "@/lib/boss-csrf";
+import { appendPermissionAuditLog, type PermissionAuditLog } from "@/lib/boss-data";
 import {
   createBossStateBackup,
   getBossStateBackupStatus,
-  listBossStateBackups,
+  listBossStateBackupProjections,
+  previewBossStateRestore,
+  projectBossStateBackupSnapshot,
   restoreBossStateBackup,
+  verifyBossStateBackup,
 } from "@/lib/boss-state-backups";
 
+type BackupAuditAction = Extract<
+  PermissionAuditLog["action"],
+  | "backup.snapshot_created"
+  | "backup.snapshot_verified"
+  | "backup.restore_previewed"
+  | "backup.restore_dry_run"
+  | "backup.snapshot_restored"
+>;
+
 function forbidden() {
   return jsonNoStore({ ok: false, message: "FORBIDDEN" }, { status: 403 });
 }
@@ -17,6 +31,21 @@ function stringValue(value: unknown) {
   return typeof value === "string" ? value.trim() : "";
 }
 
+async function appendBackupAuditLog(request: NextRequest, input: {
+  actorAccount: string;
+  action: BackupAuditAction;
+  snapshotId: string;
+  detail?: string;
+}) {
+  await appendPermissionAuditLog({
+    actorAccount: input.actorAccount,
+    action: input.action,
+    detail: input.detail ?? `snapshot:${input.snapshotId}`,
+    afterJson: { snapshotId: input.snapshotId },
+    ...buildRequestAuditMeta(request),
+  });
+}
+
 async function requireHighestAdmin(request: NextRequest) {
   const session = await requireRequestSession(request);
   if (!session) {
@@ -33,7 +62,7 @@ export async function GET(request: NextRequest) {
   if (auth.response) return auth.response;
 
   const status = await getBossStateBackupStatus();
-  const snapshots = await listBossStateBackups(50);
+  const snapshots = await listBossStateBackupProjections(50);
   return jsonNoStore({ ok: true, status, snapshots });
 }
 
@@ -53,8 +82,44 @@ export async function POST(request: NextRequest) {
         actorAccount: auth.session.account,
         reason: stringValue(body.reason) || "manual",
       });
+      const projectedSnapshot = await projectBossStateBackupSnapshot(snapshot);
+      await appendBackupAuditLog(request, {
+        actorAccount: auth.session.account,
+        action: "backup.snapshot_created",
+        snapshotId: snapshot.snapshotId,
+      });
       const status = await getBossStateBackupStatus();
-      return jsonNoStore({ ok: true, action, snapshot, status });
+      return jsonNoStore({ ok: true, action, snapshot: projectedSnapshot, status });
+    }
+
+    if (action === "verify_snapshot") {
+      const snapshotId = stringValue(body.snapshotId);
+      if (!snapshotId) {
+        return jsonNoStore({ ok: false, message: "BACKUP_SNAPSHOT_ID_REQUIRED" }, { status: 400 });
+      }
+      const verification = await verifyBossStateBackup(snapshotId);
+      await appendBackupAuditLog(request, {
+        actorAccount: auth.session.account,
+        action: "backup.snapshot_verified",
+        snapshotId,
+        detail: `snapshot:${snapshotId}; ok:${verification.ok}`,
+      });
+      return jsonNoStore({ ok: true, action, verification });
+    }
+
+    if (action === "preview_restore" || action === "dry_run_restore") {
+      const snapshotId = stringValue(body.snapshotId);
+      if (!snapshotId) {
+        return jsonNoStore({ ok: false, message: "BACKUP_SNAPSHOT_ID_REQUIRED" }, { status: 400 });
+      }
+      const preview = await previewBossStateRestore({ snapshotId, willWriteState: false });
+      await appendBackupAuditLog(request, {
+        actorAccount: auth.session.account,
+        action: action === "preview_restore" ? "backup.restore_previewed" : "backup.restore_dry_run",
+        snapshotId,
+        detail: `snapshot:${snapshotId}; projects:${preview.impact.projects.current}->${preview.impact.projects.after}`,
+      });
+      return jsonNoStore({ ok: true, action, preview });
     }
 
     if (action === "restore_snapshot") {
@@ -66,6 +131,11 @@ export async function POST(request: NextRequest) {
         snapshotId,
         actorAccount: auth.session.account,
       });
+      await appendBackupAuditLog(request, {
+        actorAccount: auth.session.account,
+        action: "backup.snapshot_restored",
+        snapshotId,
+      });
       const status = await getBossStateBackupStatus();
       return jsonNoStore({ ok: true, action, ...result, status });
     }
diff --git a/src/lib/boss-state-backups.ts b/src/lib/boss-state-backups.ts
index 377ccf8..cce2df3 100644
--- a/src/lib/boss-state-backups.ts
+++ b/src/lib/boss-state-backups.ts
@@ -25,6 +25,59 @@ export interface BossStateBackupStatus {
   detail?: string;
 }
 
+export type BossBackupScope = "global" | "company" | "project" | "conversation" | "config" | "skill" | "task";
+
+export interface BossStateBackupBusinessSummary {
+  companyCount: number;
+  accountCount: number;
+  deviceCount: number;
+  projectCount: number;
+  messageCount: number;
+  taskCount: number;
+  skillCount: number;
+  auditLogCount: number;
+}
+
+export interface BossStateBackupVerification {
+  snapshotId: string;
+  checkedAt: string;
+  ok: boolean;
+  sha256: string;
+  expectedSha256?: string;
+  message: string;
+}
+
+export interface BossStateBackupProjection extends BossStateBackupSnapshot {
+  scope: BossBackupScope;
+  storageKind: "file";
+  status: "ready" | "error";
+  verification: BossStateBackupVerification;
+  businessSummary: BossStateBackupBusinessSummary;
+}
+
+export interface BossStateRestoreImpactCounter {
+  current: number;
+  after: number;
+  delta: number;
+}
+
+export interface BossStateRestorePreview {
+  snapshotId: string;
+  willWriteState: boolean;
+  generatedAt: string;
+  summary: string;
+  impact: {
+    companies: BossStateRestoreImpactCounter;
+    accounts: BossStateRestoreImpactCounter;
+    devices: BossStateRestoreImpactCounter;
+    projects: BossStateRestoreImpactCounter;
+    messages: BossStateRestoreImpactCounter;
+    tasks: BossStateRestoreImpactCounter;
+    skills: BossStateRestoreImpactCounter;
+    auditLogs: BossStateRestoreImpactCounter;
+  };
+}
+
 function stateFilePath() {
   const configuredStateFile = process.env.BOSS_STATE_FILE?.trim();
   if (configuredStateFile) {
@@ -65,6 +118,17 @@ function snapshotPath(snapshotId: string) {
   return path.join(backupDirPath(), `${snapshotId}.json`);
 }
 
+async function readSnapshotText(snapshotId: string) {
+  try {
+    return await fs.readFile(snapshotPath(snapshotId), "utf8");
+  } catch (error) {
+    if ((error as NodeJS.ErrnoException).code === "ENOENT") {
+      throw new Error("BACKUP_SNAPSHOT_NOT_FOUND");
+    }
+    throw error;
+  }
+}
+
 async function readStateText() {
   const state = await readState();
   return `${JSON.stringify(state, null, 2)}\n`;
@@ -91,6 +155,114 @@ async function readMeta(snapshotId: string) {
   }
 }
 
+function emptyBusinessSummary(): BossStateBackupBusinessSummary {
+  return {
+    companyCount: 0,
+    accountCount: 0,
+    deviceCount: 0,
+    projectCount: 0,
+    messageCount: 0,
+    taskCount: 0,
+    skillCount: 0,
+    auditLogCount: 0,
+  };
+}
+
+function summarizeBusinessState(state: BossState): BossStateBackupBusinessSummary {
+  const skillIds = new Set([
+    ...state.skillCatalog.map((skill) => skill.skillId),
+    ...state.deviceSkills.map((skill) => skill.skillId),
+  ]);
+  const businessProjects = state.projects.filter((project) => project.id !== "master-agent");
+
+  return {
+    companyCount: state.adminCompanies.length,
+    accountCount: state.authAccounts.length,
+    deviceCount: state.devices.length,
+    projectCount: businessProjects.length,
+    messageCount: businessProjects.reduce((total, project) => total + project.messages.length, 0),
+    taskCount: state.masterAgentTasks.length,
+    skillCount: skillIds.size,
+    auditLogCount: state.permissionAuditLogs.length,
+  };
+}
+
+function impactCounter(current: number, after: number): BossStateRestoreImpactCounter {
+  return {
+    current,
+    after,
+    delta: after - current,
+  };
+}
+
+function buildRestorePreviewSummary(impact: BossStateRestorePreview["impact"]) {
+  const labels: Array<[keyof BossStateRestorePreview["impact"], string]> = [
+    ["companies", "公司"],
+    ["accounts", "账号"],
+    ["devices", "设备"],
+    ["projects", "项目"],
+    ["messages", "消息"],
+    ["tasks", "任务"],
+    ["skills", "Skill"],
+    ["auditLogs", "审计日志"],
+  ];
+  const changed = labels
+    .map(([key, label]) => ({ label, counter: impact[key] }))
+    .filter(({ counter }) => counter.delta !== 0)
+    .map(({ label, counter }) => `${label} ${counter.current} -> ${counter.after}`);
+  return changed.length > 0 ? `恢复预览：${changed.join("，")}` : "恢复预览：业务计数不变";
+}
+
+function verifySnapshotText(snapshot: BossStateBackupSnapshot, text: string): BossStateBackupVerification {
+  const sha256 = createHash("sha256").update(text).digest("hex");
+  const checksumOk = snapshot.sha256 === sha256;
+  let stateOk = true;
+  try {
+    parseStateText(text, snapshot.absolutePath);
+  } catch {
+    stateOk = false;
+  }
+
+  return {
+    snapshotId: snapshot.snapshotId,
+    checkedAt: new Date().toISOString(),
+    ok: checksumOk && stateOk,
+    sha256,
+    expectedSha256: snapshot.sha256,
+    message: checksumOk && stateOk
+      ? "checksum verified"
+      : stateOk
+        ? "checksum mismatch"
+        : "snapshot state is invalid",
+  };
+}
+
+async function loadBossStateBackupSnapshot(snapshotId: string): Promise<BossStateBackupSnapshot> {
+  const absolutePath = snapshotPath(snapshotId);
+  const text = await readSnapshotText(snapshotId);
+  const stat = await fs.stat(absolutePath);
+  const meta = await readMeta(snapshotId);
+  let schemaVersion: number | undefined;
+  try {
+    const parsed = JSON.parse(text) as Partial<BossState>;
+    schemaVersion = typeof parsed.schemaVersion === "number" ? parsed.schemaVersion : undefined;
+  } catch {
+    schemaVersion = undefined;
+  }
+
+  return {
+    snapshotId,
+    fileName: `${snapshotId}.json`,
+    absolutePath,
+    bytes: typeof meta.bytes === "number" ? meta.bytes : stat.size,
+    sha256: typeof meta.sha256 === "string" ? meta.sha256 : createHash("sha256").update(text).digest("hex"),
+    createdAt: typeof meta.createdAt === "string" ? meta.createdAt : stat.mtime.toISOString(),
+    actorAccount: typeof meta.actorAccount === "string" ? meta.actorAccount : undefined,
+    reason: typeof meta.reason === "string" ? meta.reason : undefined,
+    schemaVersion: typeof meta.schemaVersion === "number" ? meta.schemaVersion : schemaVersion,
+  };
+}
+
 export async function createBossStateBackup(input: {
   actorAccount: string;
   reason?: string;
@@ -130,6 +302,32 @@ export async function createBossStateBackup(input: {
   };
 }
 
+export async function verifyBossStateBackup(snapshotId: string): Promise<BossStateBackupVerification> {
+  const snapshot = await loadBossStateBackupSnapshot(snapshotId);
+  const text = await readSnapshotText(snapshotId);
+  return verifySnapshotText(snapshot, text);
+}
+
+export async function projectBossStateBackupSnapshot(snapshot: BossStateBackupSnapshot): Promise<BossStateBackupProjection> {
+  const text = await readSnapshotText(snapshot.snapshotId);
+  const verification = verifySnapshotText(snapshot, text);
+  let businessSummary = emptyBusinessSummary();
+  try {
+    businessSummary = summarizeBusinessState(parseStateText(text, snapshot.absolutePath));
+  } catch {
+    businessSummary = emptyBusinessSummary();
+  }
+
+  return {
+    ...snapshot,
+    scope: "global",
+    storageKind: "file",
+    status: verification.ok ? "ready" : "error",
+    verification,
+    businessSummary,
+  };
+}
+
 export async function listBossStateBackups(limit = 20): Promise<BossStateBackupSnapshot[]> {
   const dir = backupDirPath();
   const entries = await fs.readdir(dir).catch(() => []);
@@ -167,6 +365,11 @@ export async function listBossStateBackups(limit = 20): Promise<BossStateBackupS
     .slice(0, Math.max(1, Math.min(100, limit)));
 }
 
+export async function listBossStateBackupProjections(limit = 20): Promise<BossStateBackupProjection[]> {
+  const snapshots = await listBossStateBackups(limit);
+  return Promise.all(snapshots.map((snapshot) => projectBossStateBackupSnapshot(snapshot)));
+}
+
 export async function getBossStateBackupStatus(): Promise<BossStateBackupStatus> {
   try {
     const snapshots = await listBossStateBackups(100);
@@ -191,6 +394,34 @@ export async function getBossStateBackupStatus(): Promise<BossStateBackupStatus>
   }
 }
 
+export async function previewBossStateRestore(input: {
+  snapshotId: string;
+  willWriteState?: boolean;
+}): Promise<BossStateRestorePreview> {
+  const snapshot = await loadBossStateBackupSnapshot(input.snapshotId);
+  const snapshotState = parseStateText(await readSnapshotText(input.snapshotId), snapshot.absolutePath);
+  const currentSummary = summarizeBusinessState(await readState());
+  const afterSummary = summarizeBusinessState(snapshotState);
+  const impact = {
+    companies: impactCounter(currentSummary.companyCount, afterSummary.companyCount),
+    accounts: impactCounter(currentSummary.accountCount, afterSummary.accountCount),
+    devices: impactCounter(currentSummary.deviceCount, afterSummary.deviceCount),
+    projects: impactCounter(currentSummary.projectCount, afterSummary.projectCount),
+    messages: impactCounter(currentSummary.messageCount, afterSummary.messageCount),
+    tasks: impactCounter(currentSummary.taskCount, afterSummary.taskCount),
+    skills: impactCounter(currentSummary.skillCount, afterSummary.skillCount),
+    auditLogs: impactCounter(currentSummary.auditLogCount, afterSummary.auditLogCount),
+  };
+
+  return {
+    snapshotId: input.snapshotId,
+    willWriteState: Boolean(input.willWriteState),
+    generatedAt: new Date().toISOString(),
+    summary: buildRestorePreviewSummary(impact),
+    impact,
+  };
+}
+
 export async function restoreBossStateBackup(input: {
   snapshotId: string;
   actorAccount: string;
diff --git a/tests/admin-backups-route.test.ts b/tests/admin-backups-route.test.ts
index 23b5679..ef227cf 100644
--- a/tests/admin-backups-route.test.ts
+++ b/tests/admin-backups-route.test.ts
@@ -112,6 +112,21 @@ async function requestFor(account: string, role: "member" | "admin" | "highest_a
   });
 }
 
+function assertBackupProjection(snapshot: {
+  scope?: string;
+  storageKind?: string;
+  status?: string;
+  verification?: { ok?: boolean };
+  businessSummary?: { projectCount?: unknown; accountCount?: unknown };
+}) {
+  assert.equal(snapshot.scope, "global");
+  assert.equal(snapshot.storageKind, "file");
+  assert.equal(snapshot.status, "ready");
+  assert.equal(snapshot.verification?.ok, true);
+  assert.equal(typeof snapshot.businessSummary?.projectCount, "number");
+  assert.equal(typeof snapshot.businessSummary?.accountCount, "number");
+}
+
 test("admin backups require highest admin", async () => {
   await setup();
   const unauthenticated = await getBackups(new NextRequest("http://127.0.0.1:3000/api/v1/admin/backups"));
@@ -134,6 +149,7 @@ test("highest admin can create, list, and restore a state snapshot", async () =>
   assert.equal(createPayload.snapshot.reason, "before risky operation");
   assert.equal(createPayload.snapshot.actorAccount, "owner@boss.com");
   assert.match(createPayload.snapshot.snapshotId, /^state-snapshot-/);
+  assertBackupProjection(createPayload.snapshot);
 
   const mutated = await data.readState();
   mutated.projects[0]!.name = "误操作后的项目";
@@ -144,7 +160,11 @@ test("highest admin can create, list, and restore a state snapshot", async () =>
   const listPayload = await listResponse.json();
   assert.equal(listPayload.ok, true);
   assert.equal(listPayload.status.restorePointCount >= 1, true);
-  assert.equal(listPayload.snapshots.some((snapshot: { snapshotId: string }) => snapshot.snapshotId === createPayload.snapshot.snapshotId), true);
+  const listedSnapshot = listPayload.snapshots.find(
+    (snapshot: { snapshotId: string }) => snapshot.snapshotId === createPayload.snapshot.snapshotId,
+  );
+  assert.ok(listedSnapshot);
+  assertBackupProjection(listedSnapshot);
 
   const restoreResponse = await postBackups(
     await requestFor("owner@boss.com", "highest_admin", {
@@ -160,6 +180,84 @@ test("highest admin can create, list, and restore a state snapshot", async () =>
 
   const restored = await data.readState();
   assert.equal(restored.projects.find((project) => project.id === "project-before")?.name, "备份前项目");
+  assert.equal(restored.permissionAuditLogs.some((log) => log.action === "backup.snapshot_restored"), true);
+});
+
+test("highest admin can verify a backup snapshot checksum", async () => {
+  const createResponse = await postBackups(
+    await requestFor("owner@boss.com", "highest_admin", {
+      method: "POST",
+      body: JSON.stringify({ action: "create_snapshot", reason: "checksum verification" }),
+    }),
+  );
+  assert.equal(createResponse.status, 200);
+  const createPayload = await createResponse.json();
+
+  const verifyResponse = await postBackups(
+    await requestFor("owner@boss.com", "highest_admin", {
+      method: "POST",
+      body: JSON.stringify({ action: "verify_snapshot", snapshotId: createPayload.snapshot.snapshotId }),
+    }),
+  );
+  assert.equal(verifyResponse.status, 200);
+  const verifyPayload = await verifyResponse.json();
+  assert.equal(verifyPayload.ok, true);
+  assert.equal(verifyPayload.action, "verify_snapshot");
+  assert.equal(verifyPayload.verification.snapshotId, createPayload.snapshot.snapshotId);
+  assert.equal(verifyPayload.verification.ok, true);
+  assert.equal(verifyPayload.verification.sha256, createPayload.snapshot.sha256);
+});
+
+test("restore preview and dry run report impact without writing state", async () => {
+  const createResponse = await postBackups(
+    await requestFor("owner@boss.com", "highest_admin", {
+      method: "POST",
+      body: JSON.stringify({ action: "create_snapshot", reason: "preview restore" }),
+    }),
+  );
+  assert.equal(createResponse.status, 200);
+  const createPayload = await createResponse.json();
+
+  const state = await data.readState();
+  state.projects.push({
+    ...structuredClone(state.projects[0]!),
+    id: "project-after",
+    name: "备份后新增项目",
+    threadMeta: {
+      ...state.projects[0]!.threadMeta,
+      projectId: "project-after",
+      threadId: "thread-after",
+      threadDisplayName: "备份后线程",
+    },
+  });
+  await data.writeState(state);
+
+  const previewResponse = await postBackups(
+    await requestFor("owner@boss.com", "highest_admin", {
+      method: "POST",
+      body: JSON.stringify({ action: "preview_restore", snapshotId: createPayload.snapshot.snapshotId }),
+    }),
+  );
+  assert.equal(previewResponse.status, 200);
+  const previewPayload = await previewResponse.json();
+  assert.equal(previewPayload.ok, true);
+  assert.equal(previewPayload.preview.willWriteState, false);
+  assert.equal(previewPayload.preview.impact.projects.after, 1);
+  assert.equal(previewPayload.preview.impact.projects.current, 2);
+  assert.match(previewPayload.preview.summary, /项目/);
+
+  const dryRunResponse = await postBackups(
+    await requestFor("owner@boss.com", "highest_admin", {
+      method: "POST",
+      body: JSON.stringify({ action: "dry_run_restore", snapshotId: createPayload.snapshot.snapshotId }),
+    }),
+  );
+  assert.equal(dryRunResponse.status, 200);
+  const dryRunPayload = await dryRunResponse.json();
+  assert.equal(dryRunPayload.preview.willWriteState, false);
+
+  const afterDryRun = await data.readState();
+  assert.equal(afterDryRun.projects.some((project) => project.id === "project-after"), true);
 });
 
 test("state writes create automatic restore points", async () => {