Power fail safe file system

There are several things you can do to mitigate risk, though. Use a journaled filesystem (ext3, reiserfs, zfs, ntfs, etc.) Make sure you're using a battery-backed raid card Use a UPS, dang nabbit. If you're that worried about your data, it's worth the money. Oh, and also, make sure to set up and test the UPS's auto-shutdown feature on your server. [pdf]