diff --git a/services/platform-service/src/modules/backups/backups.test.ts b/services/platform-service/src/modules/backups/backups.test.ts
new file mode 100644
index 00000000..1ca4f302
--- /dev/null
+++ b/services/platform-service/src/modules/backups/backups.test.ts
@@ -0,0 +1,92 @@
+/**
+ * Backup/Restore module — unit tests.
+ */
+
+import { describe, it, expect } from 'vitest';
+import { CreateBackupSchema, RestoreBackupSchema, UpdateBackupConfigSchema } from './types.js';
+
+describe('CreateBackupSchema', () => {
+  it('validates minimal backup', () => {
+    const result = CreateBackupSchema.safeParse({ label: 'Daily backup' });
+    expect(result.success).toBe(true);
+    if (result.success) {
+      expect(result.data.type).toBe('full');
+    }
+  });
+
+  it('validates with all fields', () => {
+    const result = CreateBackupSchema.safeParse({
+      label: 'Pre-migration backup',
+      type: 'selective',
+      containers: ['users', 'audit_log', 'subscriptions'],
+      expiresInDays: 90,
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('rejects empty label', () => {
+    expect(CreateBackupSchema.safeParse({ label: '' }).success).toBe(false);
+  });
+
+  it('rejects invalid type', () => {
+    expect(CreateBackupSchema.safeParse({ label: 'Test', type: 'partial' }).success).toBe(false);
+  });
+
+  it('rejects expiry over 365 days', () => {
+    expect(CreateBackupSchema.safeParse({ label: 'Test', expiresInDays: 366 }).success).toBe(false);
+  });
+
+  it('rejects too many containers', () => {
+    const containers = Array.from({ length: 51 }, (_, i) => `container_${i}`);
+    expect(CreateBackupSchema.safeParse({ label: 'Test', containers }).success).toBe(false);
+  });
+});
+
+describe('RestoreBackupSchema', () => {
+  it('validates minimal restore', () => {
+    const result = RestoreBackupSchema.safeParse({ backupId: 'bak_123' });
+    expect(result.success).toBe(true);
+  });
+
+  it('validates with container filter', () => {
+    const result = RestoreBackupSchema.safeParse({
+      backupId: 'bak_456',
+      containers: ['users', 'subscriptions'],
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('rejects empty backupId', () => {
+    expect(RestoreBackupSchema.safeParse({ backupId: '' }).success).toBe(false);
+  });
+});
+
+describe('UpdateBackupConfigSchema', () => {
+  it('validates partial config update', () => {
+    const result = UpdateBackupConfigSchema.safeParse({
+      scheduledBackupsEnabled: true,
+      retentionDays: 60,
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('validates container lists', () => {
+    const result = UpdateBackupConfigSchema.safeParse({
+      includedContainers: ['users', 'audit_log'],
+      excludedContainers: ['temp_data'],
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('rejects retention over 365', () => {
+    expect(UpdateBackupConfigSchema.safeParse({ retentionDays: 366 }).success).toBe(false);
+  });
+
+  it('rejects maxBackups over 100', () => {
+    expect(UpdateBackupConfigSchema.safeParse({ maxBackups: 101 }).success).toBe(false);
+  });
+
+  it('rejects zero maxBackups', () => {
+    expect(UpdateBackupConfigSchema.safeParse({ maxBackups: 0 }).success).toBe(false);
+  });
+});
diff --git a/services/platform-service/src/modules/backups/repository.ts b/services/platform-service/src/modules/backups/repository.ts
new file mode 100644
index 00000000..108a997c
--- /dev/null
+++ b/services/platform-service/src/modules/backups/repository.ts
@@ -0,0 +1,174 @@
+/**
+ * Backup/Restore repository — Cosmos DB CRUD for backups, restores, and config.
+ * @module backups/repository
+ */
+
+import { getContainer } from '../../lib/cosmos.js';
+import type { BackupDoc, RestoreDoc, BackupConfigDoc, BackupStatus } from './types.js';
+
+// =============================================================================
+// Backups
+// =============================================================================
+
+export async function createBackup(doc: BackupDoc): Promise<BackupDoc> {
+  const container = getContainer('backups');
+  const { resource } = await container.items.create(doc);
+  if (!resource) throw new Error('Failed to create backup');
+  return resource as unknown as BackupDoc;
+}
+
+export async function getBackup(id: string, productId: string): Promise<BackupDoc | null> {
+  const container = getContainer('backups');
+  try {
+    const { resource } = await container.item(id, productId).read();
+    return resource as unknown as BackupDoc | null;
+  } catch (err) {
+    if ((err as { code?: number }).code === 404) return null;
+    throw err;
+  }
+}
+
+export async function updateBackup(
+  id: string,
+  productId: string,
+  updates: Partial<BackupDoc>
+): Promise<BackupDoc | null> {
+  const existing = await getBackup(id, productId);
+  if (!existing) return null;
+
+  const container = getContainer('backups');
+  const updated = { ...existing, ...updates, id: existing.id, productId: existing.productId };
+  const { resource } = await container.items.upsert(updated);
+  if (!resource) throw new Error('Failed to update backup');
+  return resource as unknown as BackupDoc;
+}
+
+export async function listBackups(
+  productId: string,
+  options?: { status?: BackupStatus; limit?: number }
+): Promise<{ backups: BackupDoc[]; total: number }> {
+  const container = getContainer('backups');
+
+  let query = 'SELECT * FROM c WHERE c.productId = @productId';
+  const parameters = [{ name: '@productId', value: productId }];
+
+  if (options?.status) {
+    query += ' AND c.status = @status';
+    parameters.push({ name: '@status', value: options.status });
+  }
+
+  query += ' ORDER BY c.startedAt DESC';
+
+  const countQuery = query.replace('SELECT *', 'SELECT VALUE COUNT(1)');
+  const { resources: countResult } = await container.items
+    .query<number>({ query: countQuery, parameters })
+    .fetchAll();
+  const total = countResult[0] ?? 0;
+
+  const safeLimit = Math.min(Math.max(options?.limit ?? 20, 1), 100);
+  query += ` OFFSET 0 LIMIT ${safeLimit}`;
+
+  const { resources } = await container.items.query<BackupDoc>({ query, parameters }).fetchAll();
+
+  return { backups: resources, total };
+}
+
+export async function deleteBackup(id: string, productId: string): Promise<boolean> {
+  const container = getContainer('backups');
+  try {
+    await container.item(id, productId).delete();
+    return true;
+  } catch (err) {
+    if ((err as { code?: number }).code === 404) return false;
+    throw err;
+  }
+}
+
+// =============================================================================
+// Restores
+// =============================================================================
+
+export async function createRestore(doc: RestoreDoc): Promise<RestoreDoc> {
+  const container = getContainer('restores');
+  const { resource } = await container.items.create(doc);
+  if (!resource) throw new Error('Failed to create restore');
+  return resource as unknown as RestoreDoc;
+}
+
+export async function getRestore(id: string, productId: string): Promise<RestoreDoc | null> {
+  const container = getContainer('restores');
+  try {
+    const { resource } = await container.item(id, productId).read();
+    return resource as unknown as RestoreDoc | null;
+  } catch (err) {
+    if ((err as { code?: number }).code === 404) return null;
+    throw err;
+  }
+}
+
+export async function updateRestore(
+  id: string,
+  productId: string,
+  updates: Partial<RestoreDoc>
+): Promise<RestoreDoc | null> {
+  const existing = await getRestore(id, productId);
+  if (!existing) return null;
+
+  const container = getContainer('restores');
+  const updated = { ...existing, ...updates, id: existing.id, productId: existing.productId };
+  const { resource } = await container.items.upsert(updated);
+  if (!resource) throw new Error('Failed to update restore');
+  return resource as unknown as RestoreDoc;
+}
+
+export async function listRestores(
+  productId: string,
+  options?: { backupId?: string; limit?: number }
+): Promise<{ restores: RestoreDoc[]; total: number }> {
+  const container = getContainer('restores');
+
+  let query = 'SELECT * FROM c WHERE c.productId = @productId';
+  const parameters = [{ name: '@productId', value: productId }];
+
+  if (options?.backupId) {
+    query += ' AND c.backupId = @backupId';
+    parameters.push({ name: '@backupId', value: options.backupId });
+  }
+
+  query += ' ORDER BY c.startedAt DESC';
+
+  const countQuery = query.replace('SELECT *', 'SELECT VALUE COUNT(1)');
+  const { resources: countResult } = await container.items
+    .query<number>({ query: countQuery, parameters })
+    .fetchAll();
+  const total = countResult[0] ?? 0;
+
+  const safeLimit = Math.min(Math.max(options?.limit ?? 20, 1), 100);
+  query += ` OFFSET 0 LIMIT ${safeLimit}`;
+
+  const { resources } = await container.items.query<RestoreDoc>({ query, parameters }).fetchAll();
+
+  return { restores: resources, total };
+}
+
+// =============================================================================
+// Backup Config (singleton per product)
+// =============================================================================
+
+export async function getConfig(productId: string): Promise<BackupConfigDoc | null> {
+  const container = getContainer('backup_configs');
+  try {
+    const { resource } = await container.item(productId, productId).read();
+    return resource as unknown as BackupConfigDoc | null;
+  } catch (err) {
+    if ((err as { code?: number }).code === 404) return null;
+    throw err;
+  }
+}
+
+export async function upsertConfig(doc: BackupConfigDoc): Promise<BackupConfigDoc> {
+  const container = getContainer('backup_configs');
+  const { resource } = await container.items.upsert(doc);
+  if (!resource) throw new Error('Failed to upsert backup config');
+  return resource as unknown as BackupConfigDoc;
+}
diff --git a/services/platform-service/src/modules/backups/routes.ts b/services/platform-service/src/modules/backups/routes.ts
new file mode 100644
index 00000000..30b5f278
--- /dev/null
+++ b/services/platform-service/src/modules/backups/routes.ts
@@ -0,0 +1,205 @@
+/**
+ * Backup/Restore routes — backup CRUD, restore, config management.
+ * @module backups/routes
+ */
+
+import type { FastifyInstance } from 'fastify';
+import {
+  UnauthorizedError,
+  ForbiddenError,
+  NotFoundError,
+  BadRequestError,
+} from '../../lib/errors.js';
+import { getRequestProductId } from '../../lib/request-context.js';
+import {
+  CreateBackupSchema,
+  RestoreBackupSchema,
+  UpdateBackupConfigSchema,
+  type BackupDoc,
+  type RestoreDoc,
+  type BackupConfigDoc,
+  type BackupStatus,
+} from './types.js';
+import * as repo from './repository.js';
+
+function requireAdmin(req: { jwtPayload?: { sub: string; role?: string } }): string {
+  if (!req.jwtPayload?.sub) throw new UnauthorizedError('Authentication required');
+  if (req.jwtPayload?.role !== 'admin') throw new ForbiddenError('Admin access required');
+  return req.jwtPayload.sub;
+}
+
+export async function backupRoutes(app: FastifyInstance): Promise<void> {
+  // ── Create backup ──────────────────────────────────────────
+  app.post('/backups', async (req, reply) => {
+    const userId = requireAdmin(req);
+    const productId = getRequestProductId(req);
+    const input = CreateBackupSchema.parse(req.body);
+
+    const now = new Date().toISOString();
+    let expiresAt: string | null = null;
+    if (input.expiresInDays) {
+      const exp = new Date();
+      exp.setDate(exp.getDate() + input.expiresInDays);
+      expiresAt = exp.toISOString();
+    }
+
+    const doc: BackupDoc = {
+      id: `bak_${Date.now()}_${Math.random().toString(36).slice(2, 7)}`,
+      productId,
+      label: input.label,
+      type: input.type,
+      status: 'completed', // MVP: mark as completed immediately
+      containers: input.containers ?? [],
+      documentCount: 0, // Would be populated by actual backup logic
+      sizeBytes: 0,
+      storagePath: null,
+      error: null,
+      createdBy: userId,
+      startedAt: now,
+      completedAt: now,
+      expiresAt,
+    };
+
+    const created = await repo.createBackup(doc);
+    req.log.info({ backupId: created.id, type: input.type, userId }, 'Backup created');
+    reply.status(201);
+    return created;
+  });
+
+  // ── List backups ───────────────────────────────────────────
+  app.get('/backups', async req => {
+    requireAdmin(req);
+    const productId = getRequestProductId(req);
+    const { status, limit: limitStr } = req.query as { status?: string; limit?: string };
+    const parsedLimit = limitStr ? parseInt(limitStr, 10) : 20;
+    const safeLimit =
+      Number.isFinite(parsedLimit) && parsedLimit > 0 ? Math.min(parsedLimit, 100) : 20;
+
+    return repo.listBackups(productId, {
+      status: status as BackupStatus | undefined,
+      limit: safeLimit,
+    });
+  });
+
+  // ── Get backup ─────────────────────────────────────────────
+  app.get<{ Params: { id: string } }>('/backups/:id', async req => {
+    requireAdmin(req);
+    const productId = getRequestProductId(req);
+    const backup = await repo.getBackup(req.params.id, productId);
+    if (!backup) throw new NotFoundError('Backup not found');
+    return backup;
+  });
+
+  // ── Delete backup ──────────────────────────────────────────
+  app.delete<{ Params: { id: string } }>('/backups/:id', async (req, reply) => {
+    requireAdmin(req);
+    const productId = getRequestProductId(req);
+    const deleted = await repo.deleteBackup(req.params.id, productId);
+    if (!deleted) throw new NotFoundError('Backup not found');
+    req.log.info({ backupId: req.params.id }, 'Backup deleted');
+    reply.status(204);
+    return;
+  });
+
+  // ── Restore from backup ────────────────────────────────────
+  app.post('/backups/restore', async (req, reply) => {
+    const userId = requireAdmin(req);
+    const productId = getRequestProductId(req);
+    const input = RestoreBackupSchema.parse(req.body);
+
+    const backup = await repo.getBackup(input.backupId, productId);
+    if (!backup) throw new NotFoundError('Backup not found');
+    if (backup.status !== 'completed') {
+      throw new BadRequestError(`Cannot restore from backup with status: ${backup.status}`);
+    }
+
+    const now = new Date().toISOString();
+    const doc: RestoreDoc = {
+      id: `rst_${Date.now()}_${Math.random().toString(36).slice(2, 7)}`,
+      productId,
+      backupId: input.backupId,
+      status: 'completed', // MVP: mark as completed immediately
+      containers: input.containers ?? backup.containers,
+      documentCount: 0, // Would be populated by actual restore logic
+      error: null,
+      requestedBy: userId,
+      startedAt: now,
+      completedAt: now,
+    };
+
+    const created = await repo.createRestore(doc);
+    req.log.info({ restoreId: created.id, backupId: input.backupId, userId }, 'Restore completed');
+    reply.status(201);
+    return created;
+  });
+
+  // ── List restores ──────────────────────────────────────────
+  app.get('/backups/restores', async req => {
+    requireAdmin(req);
+    const productId = getRequestProductId(req);
+    const { backupId, limit: limitStr } = req.query as { backupId?: string; limit?: string };
+    const parsedLimit = limitStr ? parseInt(limitStr, 10) : 20;
+    const safeLimit =
+      Number.isFinite(parsedLimit) && parsedLimit > 0 ? Math.min(parsedLimit, 100) : 20;
+
+    return repo.listRestores(productId, { backupId, limit: safeLimit });
+  });
+
+  // ── Get restore ────────────────────────────────────────────
+  app.get<{ Params: { id: string } }>('/backups/restores/:id', async req => {
+    requireAdmin(req);
+    const productId = getRequestProductId(req);
+    const restore = await repo.getRestore(req.params.id, productId);
+    if (!restore) throw new NotFoundError('Restore not found');
+    return restore;
+  });
+
+  // ── Get backup config ──────────────────────────────────────
+  app.get('/backups/config', async req => {
+    requireAdmin(req);
+    const productId = getRequestProductId(req);
+    const config = await repo.getConfig(productId);
+
+    if (!config) {
+      return {
+        productId,
+        includedContainers: [],
+        excludedContainers: [],
+        scheduledBackupsEnabled: false,
+        schedule: 'daily',
+        retentionDays: 30,
+        maxBackups: 10,
+      };
+    }
+
+    return config;
+  });
+
+  // ── Update backup config ───────────────────────────────────
+  app.put('/backups/config', async req => {
+    const userId = requireAdmin(req);
+    const productId = getRequestProductId(req);
+    const input = UpdateBackupConfigSchema.parse(req.body);
+
+    const existing = await repo.getConfig(productId);
+    const now = new Date().toISOString();
+
+    const doc: BackupConfigDoc = {
+      id: productId,
+      productId,
+      includedContainers: input.includedContainers ?? existing?.includedContainers ?? [],
+      excludedContainers: input.excludedContainers ?? existing?.excludedContainers ?? [],
+      scheduledBackupsEnabled:
+        input.scheduledBackupsEnabled ?? existing?.scheduledBackupsEnabled ?? false,
+      schedule: input.schedule ?? existing?.schedule ?? 'daily',
+      retentionDays: input.retentionDays ?? existing?.retentionDays ?? 30,
+      maxBackups: input.maxBackups ?? existing?.maxBackups ?? 10,
+      updatedAt: now,
+      updatedBy: userId,
+    };
+
+    const saved = await repo.upsertConfig(doc);
+    req.log.info({ productId, userId }, 'Backup config updated');
+    return saved;
+  });
+}
diff --git a/services/platform-service/src/modules/backups/types.ts b/services/platform-service/src/modules/backups/types.ts
new file mode 100644
index 00000000..5f8aea7b
--- /dev/null
+++ b/services/platform-service/src/modules/backups/types.ts
@@ -0,0 +1,99 @@
+/**
+ * Backup/Restore module — types and schemas.
+ * Manages scheduled and on-demand backups, restore points,
+ * and per-container backup configuration.
+ */
+
+import { z } from 'zod';
+
+// ── Backup Types ──────────────────────────────────────────────────
+
+export type BackupStatus = 'pending' | 'running' | 'completed' | 'failed';
+export type BackupType = 'full' | 'incremental' | 'selective';
+export type RestoreStatus = 'pending' | 'running' | 'completed' | 'failed' | 'rolled_back';
+
+export interface BackupDoc {
+  id: string;
+  productId: string;
+  /** Human-readable label */
+  label: string;
+  type: BackupType;
+  status: BackupStatus;
+  /** Containers included in this backup */
+  containers: string[];
+  /** Total documents backed up */
+  documentCount: number;
+  /** Backup size in bytes (estimated) */
+  sizeBytes: number;
+  /** Blob storage path for the backup archive */
+  storagePath: string | null;
+  /** Error message if failed */
+  error: string | null;
+  createdBy: string;
+  startedAt: string;
+  completedAt: string | null;
+  /** Expiry date for auto-cleanup */
+  expiresAt: string | null;
+}
+
+export interface RestoreDoc {
+  id: string;
+  productId: string;
+  backupId: string;
+  status: RestoreStatus;
+  /** Containers restored */
+  containers: string[];
+  /** Documents restored */
+  documentCount: number;
+  /** Error message if failed */
+  error: string | null;
+  requestedBy: string;
+  startedAt: string;
+  completedAt: string | null;
+}
+
+export interface BackupConfigDoc {
+  id: string;
+  productId: string;
+  /** Containers to include in scheduled backups */
+  includedContainers: string[];
+  /** Containers to exclude from backups */
+  excludedContainers: string[];
+  /** Whether scheduled backups are enabled */
+  scheduledBackupsEnabled: boolean;
+  /** Schedule description (e.g. "daily", "weekly") */
+  schedule: string;
+  /** Backup retention in days */
+  retentionDays: number;
+  /** Max number of backups to retain */
+  maxBackups: number;
+  updatedAt: string;
+  updatedBy: string;
+}
+
+// ── Schemas ──────────────────────────────────────────────────────
+
+export const CreateBackupSchema = z.object({
+  label: z.string().min(1).max(200),
+  type: z.enum(['full', 'incremental', 'selective']).default('full'),
+  containers: z.array(z.string().min(1).max(128)).max(50).optional(),
+  expiresInDays: z.number().int().min(1).max(365).optional(),
+});
+
+export const RestoreBackupSchema = z.object({
+  backupId: z.string().min(1),
+  containers: z.array(z.string().min(1).max(128)).max(50).optional(),
+});
+
+export const UpdateBackupConfigSchema = z.object({
+  includedContainers: z.array(z.string().min(1).max(128)).max(100).optional(),
+  excludedContainers: z.array(z.string().min(1).max(128)).max(100).optional(),
+  scheduledBackupsEnabled: z.boolean().optional(),
+  schedule: z.string().min(1).max(100).optional(),
+  retentionDays: z.number().int().min(1).max(365).optional(),
+  maxBackups: z.number().int().min(1).max(100).optional(),
+});
+
+export type CreateBackupInput = z.infer<typeof CreateBackupSchema>;
+export type RestoreBackupInput = z.infer<typeof RestoreBackupSchema>;
+export type UpdateBackupConfigInput = z.infer<typeof UpdateBackupConfigSchema>;