If you’ve got an old UPS laying around, and are both technically adept and extremely paranoid, have I got a project for you! This Instructables instructable is probably the most complicated way to go about this; there’s a lot of soldering and voltage metering going on when you really could simply, well, glue a small flash drive into place where the USB/RJ45 port usually is. But if you want to go the whole hog, it involves rewiring the USB interface from a little USB enclosure to make the 2.5″ HDD go naked inside the gutted UPS.