WordPress users have fun plugins and options to help them keep a back up file of their site (like WP-DB-Backup Plugin.)
But, did you know you can back up your blogger site, too?
Please, go do it now. Log into your blog, then go to Settings -> Basic -> Export Blog. Save the file to your computer. If your blog explodes or gets deleted, you still have everything.
Depending on how often you blog, depends on how often I would save that file.
Another option for saving your posts, is to compose them in Windows Live Writer. It’s like composing your posts in a document writer which you link up with blogger. Pictures and videos are easier to add, and it saves a copy of your posts, too (if you chose to do so).