If you mean it as a backup and an opportunity to return to the old state, remember that the version control system does that better.

如果你是想有一个备份用来恢复，那么记住版本控制系统做这个更加在行。

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The ability to control demand would make it easier to fit large amounts of intermittent renewable energy into the electricity system without running expensive backup generation.

拥有控制需求的能力，意味着电力公司无需维持昂贵的应急发电设备，就可以较轻易的使大量间断的可再生能源回输至电力系统。

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Do you have a browser or backup utility or security scanner or version-control system that serves you well when it operates on local files?

您拥有在操作本地文件时能很好地工作的浏览器、备份实用程序、安全性扫描程序或版本控制系统吗？

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The microgrid comprises eight 100-kW grid-tied inverters, the rooftop PV array, the lead-acid battery pack, backup diesel generators, and a Web-based monitoring and control system.

FORBES: Solar-Powered Microgrid Slashes Alcatraz Island's Dependence On Fossil Fuels