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A UPS has internal batteries to guarantee that continuous power is provided to the equipment even if the power supply stops providing power. Of course the UPS can provide power for a while, typically a few minutes, but that is often enough to ride out power company glitches or short outages. Advantages: 

Computer jobs don't stop because the power fails. 
Users not inconvenienced by computer shutting down. 
Equipment does not incur the stress of another (hard) power cycle. 
Data isn't lost because a machine shut down without doing a "sync" or equivalent to flush cached or real time data.
 
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