For those asking O NOES HOW DO I BACKUP MY LIVEJOURNAL?!
If you use Windows, I point you to ljarchive. Quick, neat, and comprehensive, as shoebox2 and others who've used it can attest. Also lets you find out interesting things about which words (barring the very common ones) you use most frequently, and things like that.
If you're on a Mac or have some other platform, however, I can't help you. Sorry.