Quote:
Originally Posted by theducks
A 'backup' LIBRARY includes Metadata.db
If tht is not there, it is just folders (with books).
 Make a NEW (temp?) Library; ADD those books to it the normal CALIBRE way .
Now you can use Copy to Library (remember to set the what to do about Duplicates section when adding)
You can either toss the Temp Library or replace your archive with a 'proper'  one |
I have metadata.db attached to the dropbox folder, but I don't know what to do with it to get calibre to recognize it.