Wait, you had a level 30 toon and only had ONE save? That should be a good (but painful) lesson learned right there.

Personally, I save every 30 minutes to an hour. Then I cut those from my saves directory and paste them to a backup drive for safe keeping. Rule number ONE with any Bethesda game is save, save, SAVE, and then save some more! I do hope you recover your .bak file though.