Quote:
Originally Posted by theducks
Do note that Calibre 5 Libraries are not backwards compatible to 3. BACKUP (metadata.db)
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But one could try Calibre 4.23 and if that works, then move to version 5. That way if version 5 is not working, one can go back to 4.23 which is compatible with the version 5 database. It's a win-win.
The only thing to do is backup the configuration directory before upgrading.