So the old LJBook is now blogbooker.com , and you can back up your whole journal at one go if you pay, I think it's like $30. My journal is YUGE because of all the photos, so I had to download each year separately, but it worked like a charm. I have PDF journals from every year safely stored on my machine and backup drives.

I also export everything over to dreamwidth every so often, as a mirror, which is free. The combination of those two methods makes me feel comfortable.