I assume you expect the CalibreLibrary directory in the cloud drive since many users already backup their Calibre collection into the cloud (I use Google Drive). We'd just point CC to that directory in the cloud.
The big question is how we are going to reverse sync?
If I mark a book as Read, and you modify the CalibreLibrary directory in the cloud, and that gets synced back to the local CalibreLibrary directory while Calibre is running... I don't think that would work. I don't think Calibre will understand other programs changing it's main metadata.db file or individual metadata.opf files on the fly.
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