backup

The police officer called for backup when the suspect attempted to flee the scene.

(Chinese) 当嫌疑人企图逃离现场时，警官请求了后援。

The hospital has a massive diesel generator as a backup in case of a power outage.

(Chinese) 医院有一台巨大的柴油发电机，作为停电时的备用电源。

It is essential to create a weekly backup of your computer files to an external hard drive.

(Chinese) 每周将电脑文件备份到外部硬盘是非常必要的。

The server crash was a disaster because the company hadn't performed a cloud backup in months.

(Chinese) 服务器崩溃是一场灾难，因为公司已经好几个月没有进行云备份了。