how to export your blog and save as xml file in your computer

1, The first step you need to do is to sign in by using your gmail account. You will see the bolgger home page like this in your right top corner, shown as follow:

2, the second step is to click Design, and then
go to settings, and choose Basic. You will find the following page:

3, now click Export blog, and a new page will be shown like this:

4, all you need to do is to click download blog yellow button and save to your computer:

You blog will be stored as a Blogger export file (.xml) file which can be kept as a backup on your hard drive or imported into another blog.
Note: Exported blogs are not deleted from your dashboard or Blogger.com

if you find it is difficult to follow, here is the link of a video from you-tube:

Video links
http://youtu.be/vE4bYfT8Lbw