I've fried a Tivo hard disk due to a power outage -- or more precisely how it went out (a couple of quick in and outs before going out). Since then, I've always put a UPS with AVR capability on my AV stuff. Now I also have a RPHDTV that needs the fan running too. So, with the UPS, there's no more fired disks, lost recordings, dead units while waiting for new parts, etc. It only has to happen once to make it worthwhile.