diff --git a/backup.py b/backup.py
index 499bd2f..9712500 100644
--- a/backup.py
+++ b/backup.py
@@ -110,16 +110,21 @@ def _cleanup(tar_path: Path) -> None:
             pass
 
 
-def backup(name: str, chunk_mb: int = VOL_MB) -> int:
+def backup(name: str, chunk_mb: int = VOL_MB, srcs: list[Path] | None = None) -> int:
     """整个文件夹 -> 单个 tar -> 32MB 卷压缩 (逐卷 7z + 逐卷加密) -> aria2 上传
 
     一个文件夹 = 一个文件 (file_id), 不分批次。
+    srcs 为 None 时用预设/配置源目录 (photos/documents/...), 显式传入则
+    备份指定目录 (PC 端任意路径, 如 /home/lou/图片)。
     """
     from metadata import _build_vol_init
     import argparse as _ap
     from transfer import TransferClient
 
-    srcs = [s for s in _src_dirs(name) if s.exists()]
+    if srcs is None:
+        srcs = [s for s in _src_dirs(name) if s.exists()]
+    else:
+        srcs = [s for s in srcs if s.is_dir()]
     files = [p for s in srcs for p in s.rglob("*") if p.is_file()]
     if not files:
         print(f"[备份] {name}: 源目录为空")
@@ -220,9 +225,10 @@ def list_backups() -> int:
 
 
 def main() -> int:
-    ap = argparse.ArgumentParser(description="一键备份: 相册/聊天记录/文档 -> 加密服务器")
+    ap = argparse.ArgumentParser(description="一键备份: 相册/聊天记录/文档/指定目录 -> 加密服务器")
     ap.add_argument("action", nargs="?", default="all", help="备份项: photos/documents/download/chat/all/list/restore")
     ap.add_argument("target", nargs="?", help="restore 的备份项")
+    ap.add_argument("--dir", help="备份指定目录 (不限于预设项, 如 /home/lou/图片)")
     ap.add_argument("--chunk-size", type=int, default=VOL_MB, help=f"卷压缩 MB (默认 {VOL_MB})")
     args = ap.parse_args()
 
@@ -230,9 +236,15 @@ def main() -> int:
         return list_backups()
     if args.action == "restore":
         if not args.target:
-            print("[错误] 用法: sz-backup restore <photos|documents|download|chat>")
+            print("[错误] 用法: sz-backup restore <备份项名>")
             return 1
         return restore(args.target)
+    if args.dir:
+        p = Path(args.dir).expanduser()
+        if not p.is_dir():
+            print(f"[错误] 目录不存在: {p}")
+            return 1
+        return backup(p.name, args.chunk_size, srcs=[p])
     names = ["photos", "documents", "download", "chat"] if args.action == "all" else [args.action]
     if args.action not in ("photos", "documents", "download", "chat", "all"):
         print(f"[错误] 未知备份项: {args.action} (photos/documents/download/chat/all)")