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My thanks to both BetterRed and PeterT.
I have some doubts about the "Find Duplicates" approach.
Probably both (say) BackUp_A and Backup_B will be free of duplicates inside each backup.
What I am after is a listing of the books that differ between Backup_A and BackUp_B.
The comparison between two .csv catalogs in Excel would work. But the prospect of spotting a few hundred discrepancies in several thousand entries is a bit daunting !
I have used "Total Commander" to list differences between the two libraries and the synchronise the libraries.
But although Total Commander then sees the two libraries as identical, Calibre still sees them as differing in book count by a few hundred.
I'm feeling a bit inadequate. Although that's not unusual at age 87 I'd still like to find a solution !
Still Baffled Basil
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