I have released AppBackup 1.0.14. This is a SECURITY UPDATE. You should update AS SOON AS POSSIBLE in order to keep your device secure.
AppBackup still does not work on iOS 4.3.x; however you should still update for security reasons. I am in the process of rewriting AppBackup so that it will work on iOS 4.3.x, and I am very sorry for the long wait.
Download or wait for it to show up on BigBoss.