i was about to recommend free file sync, i see that's already done. i run sync manually ( 1 way mirror) to cloud copy of my local calibre library in dropbox. I never looked into automating that. It updates changes very quickly
MOON READER + gives multiple options: it can directly access dropbox folders if configured or via an app like calibrebox. I have that on android tablets
if your local library mac with ODPS is alive, moon reader can access that directly also, if configured for the ODPS server location
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