Yes, I did mean to rate the plugin 4 stars even though I wasn't aware it would drop the average. For that, I do apologize. As for why I rated it 4 stars, I did so because I do think the plugin is great (which is exactly what the 4 star rating is). I had a minor issue on one site where the popup that appears when running a manual backup was malformed. I figured it was something related to the theme I'm using but I wouldn't have expected that kind of misbehavior. I didn't report it because it was minor.
However, on one of the sites I backed up, it took the plugin also 20 restarts or so to complete the backup. Why that happened, I'm not sure but the backup eventually did complete. I think the status reporting could be improved a small bit and, at the very least, the "show log" link could open the log in a new window or tab.
Most importantly, I haven't used the restore function yet so I don't know if that would work to my satisfaction. You might argue I reviewed the plugin prematurely but I wanted to review it based on the experience I had with it and so far, that experience has been great. :)