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That error is saying the books aren't "unique", that is, the book_id is the same as another. Sometimes seen when Dropbox or some other syncing service records an edit clash (in which case you end up with two "_______'s conflicting copy").
calibre requires each book have a unique internal book number and a restore will reject the duplicates.
Note that it reported success.
You can manually add those as new books if you need to.
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