backup command

例句：

1. 1. We need to backup our data before the system goes down.
   在系统崩溃之前，我们需要备份数据。
2. 2. The backup server is located in a remote area.
   备份服务器位于一个偏远地区。
3. 3. The company relies on its backup plan to survive during emergencies.
   该公司依靠其备份计划来应对紧急情况。