@
camelx - I add books into a
New Books library, I then 'do-what takes' to get the author names and titles 'correct'.
Then I use the
Find Duplicates->Find Library Duplicates feature to check if
New Books and my
Main library have any duplicates. If there are any duplicates, I resolve by doing side-by-side eyeball comparisons - I run a calibre-server against my Main library to facilitate easy access.
Added : immediately after running Find Duplicates I select all non-duplicates and move them (Copy and delete) to the
Main library. After which
New Books will only have the duplicates.
When I was doing the initial build of my Main library, I would import ~50 'books' into New Books. Not for any technical reason, but that was a quantum that I could get done-and-dusted within a couple of hours - which is the limit of my attention span these days. I'm now adding around 20 'books' a day to my library, following the same process.
I sometimes want to keep both copies of a 'book'. That's easy enough if the 'new' version is in a different format. But, if they're the same format then I 'deal' with the duplicate as described here
Calibre and Evernote
My 'books' are not commercial publications - they're PD documents, often the same text is published severally - revisions, errata, abridgment etc. FWIW I also handle the same 'book' in different languages via links to Evernote Notes in the Main library book entry.
BR