BTW, if you are in the boonies, you can make your own UPS - some large car batteries, the hacked PSUs running from your 'mains' (or wind generator) - and some 12 or 24 V inverters (depending on your storage layout) .... mains off then means that you can safely run for a while and shut down safely - also you will be more immune to brownouts and 'minor' voltage fluctations - lightning strikes excepted! :-)

Good for country dwellers... hey the overall efficiencies are lousy, but ... if it keeps ya working... :P

PS - useful to wire in a low voltage light too...