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The problem here is not two-way sync. The first issue is that two programs are accessing the calibre database at the same time - calibre itself and Box (which is syncing the changes to the cloud in the background). That's already pretty risky. The second issue is online-only files. Calibre is designed to work with local files; any changes to the database must happen without latency or delays, or again you'll risk corrupting your library. There is always some latency with online-only files.
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