In addition to classifying content by its originating location, you can classify and control where content is being sent. In the context of Trellix DLP Endpoint - SaaS, this is known as data-in-motion.
File protection rules controlling destinations include:
Cloud Protection rules
Email Protection rules
Network Communication Protection rules (outgoing)
Note
Data Network Communication Protection rules can be incoming, outgoing or both. For classifying by destination only outgoing rules are relevant.
Printer Protection rules
Removable Storage Protection rules
Web Protection rules