Livejournal Backup/Archive Tools

You can back up your journal to Dreamwidth (account is free, but if you can, toss them funds to help deal with the influx of LJ refugees). If you are a member of an LJ community, you can use LJ archive to backup the posts (not the comments): http://syredronning.livejournal.com/1530901.html

And last, you can backup multi-chaptered LJ fic via SqueeBook: http://www.squeebook.net/