Blogger help page for backing up is here. Look for "Exporting Your blog" at the bottom of the help page.
Making A Backup- Blogger now has a simple way to make a backup copy of your blog. Note that the resulting file saves only the text, not the photos. When you build the blog page, however, Blogger automatically stores a copy of your photos in a Google Picasa album.
Outline Of Steps - New Interface (added 4/1/2012)
- To export your blog, simply click "Export Blog" from the Settings | Other tab.
- Use the 'Settings' tab, then on the first line look for "Blog Tools", and a link that says "Export blog".
- More details are on the Blogger Export Blogs Help Page .
PDF "Pseudo Backup"
You can also make a "Pseudo Backup" by saving ALL the posts to a single PDF file. But note you have to make copies of the "pages" and save them as "posts" -- more details on Page 4, small Para. c near the buttom.
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This page updated 4/1/2012 by James R. Ingram