Thread: Upgrading Calibre triggers full library backup ?
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Old 08-14-2011, 02:05 AM   #17
DoctorOhh
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There doesn't seem to be any mystery here. I believe if you essentially write new data to any custom column then the metadata.opf file for each of the books with new data will have to be backed up again.

The metadata.opf files get updated whenever new library data for the book is written.
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