[Geta]

Thanks Kovid. It didn't work - unfortunately I think I've stuffed things up irreversibly by trying to fix the problem myself rather than coming here first and asking for help from the experts.

Edit: I've managed to get a backup of the database from another hard drive I had this synced to. It's a month since I last synced them so I've lost some work but I'm not back to square one at least.

I now have a library sitting in a folder that contains more books than are included in the library.

What is the best way to add the new books while skipping over the ones that are already in the library?