[marp68]

Before doing an reinstallation of Windows I did an export of all calibre data It became two parts:
part-0001.calibre-data
part-0002.calibre-data

I also made a simple copy of the calibre library folder.

After reinstallation of OS and Calbre software I imported it back and, voila, there were all books and settings in Calibre, except some addon plugins.

But when I compared the books in the new library, created through the import calibre data process, with the to the copied calibre library folder, I noticed a difference. In the copy of the calibre library there were this metadata file in each book folder together with the book and the cover. But in the new library that was created through the import of the calibre data files, the metadata file for all books where now missing in the book folder. There is only the book itself and the cover.

Am I missing something here? I thought the metadata file was imprtant. But when I look at a book in Calibre, with a missing metadatafile, it looks the same as before, when it had a metadata file.

I also deleted the new library and imported the old calibre library backup that I before simply copied to my backup hard disk, and I don't see any differencies.

I understand that something wrong, but can't put my finger on what it is. Please advice me what to do.

I have both the two exported calibre data files and a copy of the calibre library.