Well, I'm also not a fan of PDF. What I think, PDF isn't the best way for keeping stories, or even making archieves. I've allways uses plain text to do that, because of compresibility and regexp functionality. Also HTML code is just a pure text
Talking about backups - changing the naming schema is good think. But mysqldump works fine, so I don't see the need to get rid of it. It's stable enough, even under Windows And don't forget - this tool comes as a part of MySQL installation, what prevents for uncompatibility
About new features - maybe implementing WYSIWYG stories editor (or even all textboxes as a WYSIWYG editor) is worth of look? I've added this functionality in my site and it works just fine for me. If You want look at it - look here: http://www.interactivetools.com/products/htmlarea/.
Regards