Do you have a 6T drive? Books just take drive space in Calibre.
All it keeps in the DB is metadata, so Maxing out your RAM on a 64bit system should handle that for all but insane sized commercial libraries. Yes, there is a bit of slow down, but nothing like we saw back in the days of the PCAT (286 w/2M RAM 40M HD).
(right-click) Copy to Library will merge selected books into the designated Library.
IMHO reasons for separate Libraries:
Security. PG/Adult material kept separate
Significant Metadata (custom field) differences. Wide tables are bloat if they exist only for a small % of the records
Drive space: remember, Calibre can only run on LOCAL attached drives. No NAS or shares for the Libraries used by Calibre.
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