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I think it would be a great extra service if Dropbox could do a security scan on any X set of files (and recursively). This could be as files are added or on a scheduled basis.
I see this being don...
Dropbox content uploaded to the cloud with smart sync is not scannable by virus scanner on the host computer since only a stub is stored there.
Therefore It might be an option for Dropbox to offer a virus scan including ransomware detection.