I use Lazarus a lot, not just to recover lost posts but to pull up things I've typed that I need to refer back to. It's been a real convenience and a life saver to me and, on another forum, a writing partner whose post was lost when a server crashed. Because I had copied his post into the "go advanced" reply screen I had his as well as the one of mine that was lost.
If you use computers that aren't your own personal computer you could try typing your posts as a draft in your email account. They usually have autosave and you'll have a record of the post or a stored copy if you need it. I do a lot of that. It's a little more convenient for me than something like Google docs or having to save a word doc on a foreign computer, attach it to an email and then remember to delete the doc from the file and the trash.