diff --git a/backup.py b/backup.py
index b300d60..be57905 100644
--- a/backup.py
+++ b/backup.py
@@ -196,8 +196,33 @@ def _upload_tar(tar_path: Path, chunk_mb: int) -> str:
     return str(receipt["file_id"])
 
 
+def _prune_manifest(name: str, manifest: dict[str, Any]) -> None:
+    """服务器同步: 服务器已不存在的批次从 manifest 移除, 其文件重新纳入增量
+
+    服务器文件被删 (手动/清理) 后 manifest 仍认为已备份会导致"无增量更新"
+    但实际恢复不到——以服务器 file_id 为准剪枝, 下次备份自动重传。
+    """
+    from transfer import TransferClient
+    try:
+        client = TransferClient(_server(), token=_token())
+        server_ids = {f["file_id"] for f in client.list_files()}
+    except Exception:
+        return  # 服务器不可达: 保留 manifest, 不阻塞备份
+    batches = manifest.get("batches", {})
+    stale = [bn for bn, b in batches.items() if b.get("server_id") not in server_ids]
+    if not stale:
+        return
+    for bn in stale:
+        for fp in batches[bn].get("files", []):
+            manifest.setdefault("files", {}).pop(fp, None)
+        batches.pop(bn)
+    print(f"[备份] 服务器同步: 移除 {len(stale)} 个失效批次 (服务器文件已删), 将重新备份")
+    _save_manifest(name, manifest)
+
+
 def backup(name: str, chunk_mb: int = 10) -> int:
     manifest = _load_manifest(name)
+    _prune_manifest(name, manifest)
     files = _scan_new(name, manifest)
     if not files:
         print(f"[备份] {name}: 无新增文件, 已是最新")
diff --git a/debian/7z-encrypt-client/DEBIAN/control b/debian/7z-encrypt-client/DEBIAN/control
index 8eeb5e3..9c26585 100644
--- a/debian/7z-encrypt-client/DEBIAN/control
+++ b/debian/7z-encrypt-client/DEBIAN/control
@@ -2,7 +2,7 @@ Package: 7z-encrypt-client
 Version: 1.0.0
 Architecture: all
 Maintainer: edgevoid <edgevoid@users.noreply.gitee.com>
-Installed-Size: 125
+Installed-Size: 126
 Depends: python3 (>= 3.10), python3-venv, p7zip-full
 Section: utils
 Priority: optional
diff --git a/debian/7z-encrypt-client/DEBIAN/md5sums b/debian/7z-encrypt-client/DEBIAN/md5sums
index 87bdf84..f0de9a9 100644
--- a/debian/7z-encrypt-client/DEBIAN/md5sums
+++ b/debian/7z-encrypt-client/DEBIAN/md5sums
@@ -2,7 +2,7 @@
 440c53f84f5722b5146959c8fc6d7a23  usr/bin/sz-config
 ec8cf0df841e479689ccb681f6168ccc  usr/bin/sz-transfer
 0ba5b8147990daa7fd07344952c42847  usr/bin/sz-tui
-1c8e2524738649398a4385a3f2a9e3c6  usr/share/7z-encrypt/backup.py
+d0faeb4f34bb1cec041c9a4616e529be  usr/share/7z-encrypt/backup.py
 dcb31e74e0a6ee8073337fc4fb2acf99  usr/share/7z-encrypt/config.py
 8a064c0b3c21d50812a3fd69a320d862  usr/share/7z-encrypt/crypto.py
 21062e04f8c7f4471881a39c489dfa73  usr/share/7z-encrypt/metadata.py
diff --git a/debian/7z-encrypt-client/usr/share/7z-encrypt/backup.py b/debian/7z-encrypt-client/usr/share/7z-encrypt/backup.py
index b300d60..be57905 100644
--- a/debian/7z-encrypt-client/usr/share/7z-encrypt/backup.py
+++ b/debian/7z-encrypt-client/usr/share/7z-encrypt/backup.py
@@ -196,8 +196,33 @@ def _upload_tar(tar_path: Path, chunk_mb: int) -> str:
     return str(receipt["file_id"])
 
 
+def _prune_manifest(name: str, manifest: dict[str, Any]) -> None:
+    """服务器同步: 服务器已不存在的批次从 manifest 移除, 其文件重新纳入增量
+
+    服务器文件被删 (手动/清理) 后 manifest 仍认为已备份会导致"无增量更新"
+    但实际恢复不到——以服务器 file_id 为准剪枝, 下次备份自动重传。
+    """
+    from transfer import TransferClient
+    try:
+        client = TransferClient(_server(), token=_token())
+        server_ids = {f["file_id"] for f in client.list_files()}
+    except Exception:
+        return  # 服务器不可达: 保留 manifest, 不阻塞备份
+    batches = manifest.get("batches", {})
+    stale = [bn for bn, b in batches.items() if b.get("server_id") not in server_ids]
+    if not stale:
+        return
+    for bn in stale:
+        for fp in batches[bn].get("files", []):
+            manifest.setdefault("files", {}).pop(fp, None)
+        batches.pop(bn)
+    print(f"[备份] 服务器同步: 移除 {len(stale)} 个失效批次 (服务器文件已删), 将重新备份")
+    _save_manifest(name, manifest)
+
+
 def backup(name: str, chunk_mb: int = 10) -> int:
     manifest = _load_manifest(name)
+    _prune_manifest(name, manifest)
     files = _scan_new(name, manifest)
     if not files:
         print(f"[备份] {name}: 无新增文件, 已是最新")