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Custom Columns IS part of the metadata.DB
metadata_db_prefs_backup.json is the (empty)DB structure recovery.
It contains everything to make an empty Library just like the real one in that folder.
And every Title folder contains metadata.OPF the metadata for the book. cover.jpg is the cover that you selected for that book
User settings, plugins, optional icons are in the configuration folder.
KISS (and take the guesswork out)
Use the built in Export/Import too. It does all (selectable) KNOWN (on the quick switch list) Libraries AND all user configuration settings.
The reason some of the experts choose other ways have a lot to do the amount of time and data for a FULL export.
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