Back up your blog and back up often! With most blog platforms, you can just export your blog at any time and save it in a folder so that you will always have your entries, comments, etc. I don’t know how many e-mails I get a week from people saying “Help! My blog got erased” only to find out that they never backed up their blog.
As soon as you read this.. export your blog and save it to a folder on your computer so you can rest easier :)