Thank you @haertig, that was helpful and worked well.
However, I still have a major problem: I inserted an additional column called "genre" in my original Calibre library and attrituted my ebooks correspondingly. (I did this to match genres with collections on my tolino). The genre metadata is still saved in the ebook metadata files, I checked that.
After restoring the library the column "genre" does not show up anymore. After creating the column "genre" again in Calibre Settings, the ebooks are not attributed to the genres, I would have to it manually (which would be a pain with 700 ebooks). The strange thing is: The attribution to "genre" is saved in the ebook metadata files but it doesn't show up in the library.
Any ideas how I can fix this?
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