backup control data set

例句：

1. 1. The backup system ensures data redundancy in case of a power outage.
   备份系统确保在电源中断时数据冗余。
2. 2.The company's back-up plan is to reopen the factory as soon as possible.
   公司的备用计划是尽快重新开放工厂。
3. 3. The backup generator was used during the power failure to keep the lights on.
   在停电期间，备用发电机被使用来保持灯光亮着。