The general rule of thumb is to always create a backup before beginning.

一般的经验法则是一定要在更新之前创建一个备份。

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While the book's prescriptions are often too general — teachers must show empathy and resolve, and communities should provide backup — its descriptions of the task facing teachers are superb.

虽然该书开出的药方过于笼统——教师必须能够做到换位思考、意志坚决，同时社会必须提供支持，但是它对对教师面临的任务所作的描述却极为出色。

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If you are backing up to a tape drive (as specified in the Destination section of the General page), the Unload the tape after backup option is active.

如果备份到磁带机(如同“常规”页的“目标”部分指定的一样)，则“备份后卸载磁带”选项处于活动状态。

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In fact industrial giant General Electric uses one such backup service for all of its hundreds of thousands of user workstations.

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For this year's general election, Nevada is the only state where virtually every voting machine has a paper backup that could aid in a machine malfunction, an audit or a recount.

CNN: Nevada improves odds with e-vote

General Atomics, the manufacturer of the Predator and the Reaper, argues that its later models have more backup systems to prevent those momentary losses of control.

FORBES: Magazine Article