backing up

例句：

1. 1. We need to back up our data before we make any changes.
   在更改数据之前，我们需要备份数据。
2. 2. The server is running slowly because the backup is corrupted.
   服务器运行缓慢，因为备份文件损坏了。
3. 3. I backed up my important documents before I left for vacation.
   我度假前备份了我的重要文件。