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It is certainly true that the safest way to use calibre with Dropbox/other is to do a one-way mirror into the Dropbox folder.
But it is also (probably) irrelevant.
If you are careful, as the OP has indicated, one-way sync is not needed to prevent Dropbox/calibre editing conflicts. The most likely source of failure. Although extra safeguards are always good.
For the record, I have used calibre a long time without doing a one-way sync and never once had problems.
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