On-demand backup of your WordPress database.
does not work with WP3.9.1
I've used this plugin for backups on multiple sites for a couple of years, but for the first time ever, it didn't work at all on a new site I'm building with WordPress 3.5.1. I'm concerned that the plugin hasn't been updated in over two years. Is it still supported?
I think it's time to switch to something else. There are a lot of good alternatives. Online Backup for WordPress looks very attractive.