If you have ever had your site go down you know the extreme panic that rushes through you. My blog went down a couple days ago and I was not a happy camper.
Having a way to backup you posts is extremely important. If you do not have a backup and something occurs all of your work is gone. Of course if you have saved all your posts you can always go back and copy and paste your blog back into existence, by why do all that work when there are other alternatives?
If you have your own hosting, you can go into your hosting panel and backing up your site from there. Doing this before making any massive changes is very easy and can save you loads of time in blog recreation.
However, you probably do not want or have the time to go into your hosting cpanel daily and backup every time you make a post. So here are some alternatives.
If you have your own hosting and have a wordpress blog I highly recommend WP-DB- Backup. It is a plugin that you can schedule to back up your blog. You can schedule it daily, weekly, monthly, etc. You can even have the backup delivered to your email.
If you have a blogger blog you can backup your posts with blogger backup. Blogger backup allows you to backup posts and comments from your blogger blog. You select the blog you want to back up and how many posts you want to save.
There are other backup options out there which you can find with a simple search. I would recommend doing this if you do not have a backup system in place you may want to jump on it now and put your mind at ease.