Update sync_data.sh

sync_data.sh

@@ -10,7 +10,7 @@ fi
 # 激活虚拟环境
 . /opt/venv/bin/activate
 
-# 备份管理函数
+# 备份管理函数（删除旧备份并重置 Git 历史）
 manage_backups() {
     python3 -c "
 from huggingface_hub import HfApi
@@ -19,9 +19,10 @@ try:
     files = api.list_repo_files(repo_id='$DATASET_ID', repo_type='dataset')
     backup_files = sorted([f for f in files if f.startswith('electerm_backup_') and f.endswith('.tar.gz')])
     backup_count = int('$DATASET_N') if '$DATASET_N'.isdigit() else 5
-    for file in backup_files[:-backup_count]:
-        api.delete_file(path_in_repo=file, repo_id='$DATASET_ID', repo_type='dataset')
-        print(f'Deleted old backup: {file}')
+    if len(backup_files) > backup_count:
+        for file in backup_files[:-backup_count]:
+            api.delete_file(path_in_repo=file, repo_id='$DATASET_ID', repo_type='dataset')
+            print(f'Deleted old backup: {file}')
 except Exception as e:
     print(f'Error managing backups: {str(e)}')
 "