Back up Your Blog

Back up blog? is it important?
Yes it's very important. Because we can't guarantee that our blog will exist forever. Lately, many blogers lost their blogs because of unpredicted fault . Few months ago I lost all of my blog (it'a about 10 blogs), but now I got some of them back. Since then I know how important to back up our blog. It's really frustating when your hard work suddenly lost.