IMO, it's important to preserve other backup copies as well. I had lost around two months of blog posts due the corruption. If the blog is of any importance to you, then having just one copy is not enough.
I am totally aware of all the concern issues mentioned above and that is the reason I always maintain a copy of my blog posts locally. I know that holding database backups is better, but nevertheless I will opt the solution, which is suggested by Lucifer.
It's always good to maintain a back up of your blog posts, And it would also be great if you store them in various devices such as in CDs or USB. Even so, there is a particular plug in available for backing up blog entries. So no need to get scared once you install plug in...But make sure to use backup option in cPanel as well.