Great plugin, Daniel. I've been using this for a while, and whenever someone asks me about backup plugins, this is always the first one I recommend.
I'd like to request an option to back up all tables, as an alternative to checking the boxes separately. I'm using this plugin on a large multisite installation, and sometimes boxes get unchecked. So it can be very time-consuming for me to go through and check boxes manually. It would be really great if there was a new check box below the database table list, "Back up all the tables listed above."