[...] Dropbox syncs not only its own folder but also everything in local drive (C:) without any user consent or permission. I caught it red-handed while working with my DLP (data loss prevention) endpoint agent that I adjust DLP system to work properly on production environment.
However, according to information security researcher Darren P. Meyer, this might not be the case:
The Dropbox application uses a filesystem monitor to detect when changes are made by monitoring filesystem write events. This is, by necessity, a system-wide process. So DLP alerting that Dropbox is “acccessing” a new file shouldn’t be surprising.
Likewise, the Dropbox application routinely communicates with its sync infrastructure at Dropbox and AWS endpoints, so it’s not surprising to see Dropbox communicating regularly to check whether there is a new sync point or the like.
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