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Calibre saves stuff in either of 2 places depending on:
Library specific (eg contains custom columns, and other rules that wold fail if used with a different Library (structure) ) IN the LIBRARY'S metadata.db
Per User preferences (not Library specific): The configuration folder.
This include plugins (some of their settings are also Library specific, so the settings may be in both places)
This 'duality' is why you should probably do a backup of the configuration folder along with a Library backup any configuration change.
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