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You mean a backup for the UPS?
Really, that would be overkill.
We needed the UPS once in 10 years. And while total loss of electricity would be a problem (I was on duty when we had to shut down the system due to water shortage; it was water cooled and used 60 liters of tapwater per second) it could be all up and running again in an hour or so, even though setting the right restart parameters was sometimes a hassle. You needed to determine the exact transaction where the system shut down for every process running.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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