Alan Freedman -- The Computer Language Company - Computer Desktop Encyclopedia
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backup power

An additional power source that can be used in the event of power failure. See UPS and backup.

A Half Minute of Backup
This roomful of lead acid batteries stands ready to drain itself entirely in less than a minute. It serves as backup power in a large datacenter between the time a power outage has been detected and the generators can come up to full speed.

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