world backup day 2011 march 31Do you know what today is? No, it's not Friday (thanks, Rebecca Black fans, you can sit down now) ... it's World Backup Day!

If you haven't backed up the important data on your hard drive in a while, now is the time. You should also go back through your old backups and make sure they still work, 'cause nothing brings out a geek's tears like unexpected data loss.

If you want to learn more about how and why to back up your files, check out the official site of World Backup Day. This new semi-holiday is (not surprisingly) brought to you by a group of helpful Redditors. The internet really needs more geeky holidays, especially when they're as practical as this one!