Thank you for your quick response. However none of those hasn't happened. I mean I didn't accidentally mixed the folders. And yes I thought something happened within the pdf files and it was strange to me too why it changes pdf files in original location, but when I saw today that lrfs files were missing from original library only opf files were left in folders.... Anyway since I really like this software I did a back up of missing files again and from now on I will backup book by book as i am adding them. And if the problem appears again will let you know :-) Thank you again :-)
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