BlogBackupOnline
I took a quick look at PC World's 100 Blogs We Love and spied BlogBackupOnline (https://www.blogbackuponline.com/). It looked easy and free so I signed up. I didn't want to worry about losing my blog if Blogger had a failure or if I accidentally deleted it. (Deleting ones own blog by mistake seems to happen fairly frequently by the number of questions asking how to get it back (you can't) on the WordPress help forums.)
BBO was as easy to use as it looked, and is currently free. It also did a better job and was more robust than I anticipated. I added all four of my blogs to be backed up. BBO crawls each blog for a "full" back up when added for the first time, then daily backs up any changes, including comments, using your blog's RSS feed. It even allows you to upload your blog to another provider (say, if you wanted to move your blog from Blogger to WordPress). I signed up yesterday and today it did as promised and ran the daily back up. So far so good!