If transaction logging is used for backups, use this switch only before the full backup schedule (once a week).

如果事务日志用于备份，只在完全备份计划(每周一次)之前使用此开关。

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Many customers using PowerHA SystemMirror switch from production to backup regularly, giving them added confidence in their disaster recovery plans.

许多使用 PowerHA SystemMirror 的客户会定期从生产节点切换到备份节点，这些技术让他们对自己的灾难恢复计划更加有信心。

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When a conflict is detected, they switch to a backup slice of unused spectrum on the fly.

一旦冲突被检测出来，它们可即时切换到未用频谱的备份频段。

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Software can and does go wrong, but why did the exchange not switch to its backup systems, or try routing orders to other platforms?

WSJ: Current Account: Capital Market Tech Snags Grow Alarmingly Frequent

But they go to the back of the pack if they wreck their cars in the qualifiers, or at any time before Sunday's race, and have to switch to a backup car, Warfield said.

CNN: February 18, 2013 -- Updated 1912 GMT (0312 HKT)

For example, if our laptop were to fail at a trade show, being able to access the camera menu and switch to our phones or tablets would make a great backup.

ENGADGET: Eye-Fi Pro X2 16GB Class 10 hands-on Hands-on