diff --git a/backend/services/snapshot-service/src/application/services/snapshot-orchestrator.service.ts b/backend/services/snapshot-service/src/application/services/snapshot-orchestrator.service.ts
index cd9b2841..752bc4a8 100644
--- a/backend/services/snapshot-service/src/application/services/snapshot-orchestrator.service.ts
+++ b/backend/services/snapshot-service/src/application/services/snapshot-orchestrator.service.ts
@@ -112,10 +112,13 @@ export class SnapshotOrchestratorService implements OnModuleInit {
             throw new Error(`备份处理器不存在: ${target}`);
           }
 
+          let lastDbWriteTime = 0;
           const result = await handler.execute(outputDir, (percent, msg) => {
             this.gateway.emitProgress(taskId, target, percent, msg);
-            // 进度更新不频繁写库，每10%写一次
-            if (percent % 10 === 0) {
+            // 每 2 秒写一次 DB，保证前端轮询能看到进度变化
+            const now = Date.now();
+            if (now - lastDbWriteTime >= 2000) {
+              lastDbWriteTime = now;
               this.repo.updateDetailProgress(taskId, target, percent).catch(() => {});
             }
           });