Practically it means when Begin backup is issued, an operating system copy should follow, and then quickly end by an End backup.

实际上，在执行 Begin backup后，接下来应该立刻执行系统复制，然后由 End backup 来快速结束操作。

youdao

Begin when I give the command.

我发出命令时开始。

《牛津词典》

When does the concert begin?

音乐会什么时间开始？

《牛津词典》

Tornadoes form when winds blowing in different directions meet in the cloud and begin to turn in circles.

VOA: special.2009.06.09

So,all this is,is just,as we begin to ask ourselves, what could it possible mean when people say everyone dies alone?

所以我们要开始问自己，人们说他们孤独而死的时候是什么意思？

耶鲁公开课 - 死亡课程节选

When you start describing the significance of a symbol like the tunnel, which recurs in the book, you immediately begin to limit it, and a symbol should go on deepening.

当你开始描述一个象征的意义,比如说在书中，反复出现的隧道，当你一开始予以限制，这个象征就会继续深化。

耶鲁公开课 - 1945年后的美国小说课程节选

But when Begin, as part of his Camp David settlement with Anwar Sadat, returned the Sinai to Egypt and, with the help of the Army, went about dismantling the Jewish settlements there, leaders of the settler movement felt betrayed.

NEWYORKER: The Party Faithful

The law, a Reagan-era legacy, requires employers to distribute notices to employees about COBRA when they begin their employment and also when an event such as divorce, job loss or death triggers COBRA-mandated coverage.

FORBES: COBRA's Bite

We will, however, start to be better prepared when we begin to address the above questions and when Congress takes proactive measures that will help counter cybercrime.

FORBES: Congress Needs to Go Back To School on Cyber Legislation