Catastrophic Failure of BackWPUp

I installed and have been using this plugin for several months. When I started using it, I confirmed that it was working. Every once in a while, I’d watch the plugin as it show itself dumping files, zipping them up, and storing them redundantly. This week, I made a small mistake when editing a page on my site. Rather than try to reconstruct it, I figured I’d just restore from last night’s backup. My backups are replicated both on my web server and in Dropbox. I went to the directory where my backups are stored. Sure enough, there’s one there for each of the last 30 days. I unzipped the most recent one, found the database .sql file, and used mysql to overwrite my current database with its contents. I started up my site, and it came right up, just as expected. Except, except, the contents were a freaking MONTH (actually six freaking weeks) old. I unzipped every zip file, and it turned out that every one of them had a database from APRIL 12, not May 25. Somehow, this plugin, without issuing any errors whatsoever, included a weeks old sql dump rather than an up to date mysql dump in the zip file it created. I just lost SIX WEEKS worth of work with no possibility of recovering all that work. It’s really a disaster. So, what went wrong? I don’t know. I’m too depressed even to try to figure it out. Any ideas?