Originally Posted by bhoyt
kovidgoyal: as noted in #4 I have run in debug mode and your comment "That error message basically means that the restore failed to find a single restorable book." seems to describe what has happened. But I am no further along in finding the problem.
If you Peek into the Library folder (this is one of those time YOU Should
can you see Author folders?
If you spot check a few:
do you see a:
title (###) folder
and in that:
metadata.opf , <-- this is what calibre will use to reconstruct
title.(format) <-- (does not exist for a 'empty' book