No, plugins store their configuration in the calibre configuration directory.
"metadata_db_prefs_backup.json" contains library-specific information -- basically, anything that is stored in the metadata.db
This includes custom column configuration, which columns are shown/hidden/ordered, saved searches/virtual libraries, etc.
Some plugins store extra info in the database, for example, the OverDrive Link plugin stores the "Discovered Books" in the database.
Last edited by eschwartz; 12-01-2015 at 04:18 PM.
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