Thank you for your suggestions! I'd hate to loose my books :-)
@theducks: I'm not sure what you mean by the cloud.
All my libraries are on the local harddrive in my pc. I do not store them in dropbox, cloud or network location (only backup on external HD and network drive once in a while).
Every individial book folder only contains cover and metadata.opf. The epub has vanished?
What I did was the following:
in "work in progress library:
-for individual books sort out and delete duplicates, keep only one copy
-download metadata and bookcovers per book
-all epubs could be opened, looked just fine, no errors
-some bulk metadata editing: set language, update title case and title sort
-copy books to my "real" library, using option delete after copy
These books are all faulty.
I did the same for books in another temporary library, and moved them to the same real library, and these seem fine.
Some books in my "real" library that I haven't touched in years (in Calibre anyway) have also disappeared. Oh, that may not be completely true, for a few I did change the series name.
@MartyTX: the recycle bin did not contain misplaced epubs, only the duplicates I intentionally deleted (the entire folder is in the bin).
Any ideas?
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