backup space flight crew

例句：

1. 1.The server needs to be backed up regularly to prevent data loss.
   服务器需要定期备份，以防数据丢失。
2. 2. The backup system is designed to recover from any hardware failures.
   备份系统设计用来从任何硬件故障中恢复。
3. 3.The company relies on its backup plan in case of unexpected events.
   公司在意外事件发生时依赖其备份计划。