Hey Blogger friends. It's time for you to be responsible and learn how to backup your blog. (Assuming that you lack that skill.) It's easy and will only take you a few minutes, so just do it.
1. Login to your Blogger dashboard.
2. Click Settings.
3. Click Other.
4. Click Export blog.
5. Find the XML version of your blog on your computer (if you have a PC, go to My Computer and check Downloads), and put it somewhere you'll remember. It doesn't hurt to put it in a few places. I put mine in My Documents and in Dropbox.
6. You're awesome.
To back up your blog template, go to Template and then click Backup (Backup will be in the upper right-hand corner of the screen) and repeat step 5. Step 6 is just a statement of fact.
You can visit this link for more in-depth instructions.