Perhaps calibre expects it's files to be available where they are supposed to be stored and not removed at the whim of a cloud storage solution?
As you may have noticed over the years from messages posted by others, using a one way sync to backup your library works quite well. What you are trying to use is a two way sync which is almost always a path to a corrupt library. If you really think there is no chance of corruption, you are kidding yourself.
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