backup your blog on a daily basis. If you're that afraid its going to happen. Purchase a domain name for like $10.00 USD, get hosting for your domain and restore your backup. Then you won't have to worry about it. Don't go with a cheap host. Especially for a blog using wordpress or some other blog script. They can sometimes be heavy. I recommend starting with a VPS, just so you don't have to worry about a shared webhosting company suspending your site after traffic gets a little heavy or if you have a spike in visitors one day. Then you have to worry about it happening again and you will start looking for a VPS. Don't go for the cheapest company you find. You get what you pay for!

-Eddie