LJ is migrating its servers on Tuesday, Nov. 18, at 8 AM PST (12 midnight Tue/Wed, RP time). You may want to back up your journal, just in case. *knocks on wood*
Below are some of the commonly recommended programs I've seen:
LJBackup ---
LJ Archive ---
LJDump ---
LJBook ETA: Don't forget to create a temporary password for use when backing up your journal.
Son of ETA: I just realized it's been 5 years and one month to the day that I first posted on my online journal. Gosh! (TM Archie.)
Kapitbahay ni ETA: I tried both LJBackup and LJArchive and I like LJArchive better.