Hi Fez.
It sounds like nothing but bad news to me. If you've tried to restore the backup save file and you don't have any other backups made, I don't believe there's anything else to do. In the future, I suggest saving several copies of the game file, for example Pendragon A, Pendragon B, Pendragon C, etc. That way, if your file gets corrupted, you have more choices to restore your game. You may lose some play time, but that's not nearly as bad as losing the entire file. I'm really sorry you hit this snag.