Have you kept a backup of this file?

你把这件备份了吗?

The hospital has a backup generator in case there is a power failure.

医院有备发电机以防停电。

She once sang backup for Madonna.

她曾经为麦当娜伴唱。

We had no computer backup and had to rely on old paper files to reconstruct the records.

我们没有计算机备份,只得靠落后的纸档案重做记录。

The CROSSCHECK command synchronizes the logical records of RMAN backups and copies with the files on storage media.

CROSSCHECK命令RMAN备份和存储介质上副本的逻辑记录。

On Monday they even tested a backup procedure—canting the shovel at the end of the probe's robotic arm and shaking it to dribble soil a bit at a time.

周一他们甚至尝试了一种替代方法，即将探针的机手尾部的铲子倾斜来一次弄下一点土壤。