Quote:
Originally Posted by theducks
Missing metatdata.opf ?
Someone has been playing under the skirts or letting a 'file cleaner' run amok 
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Not necessarily. If I copy some books from library A to library B and then close calibre without opening library B then the books I copied to library B won't have any opf files. I only just 'discovered' this.
Quote:
Originally Posted by theducks
Never fear: run (from the Library Icon):
Library Maintenance: Library metadata backup status: click-Queue all books.
This takes quite some time to run. Just minimize and do other stuff.
The same place as the button shows the count remaining.
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I knew there had to be a better way
And the calibredb backup_metadata command will do the same thing but should be faster -
http://manual.calibre-ebook.com/cli/calibredb.html#
BR