For high-security applications, you can configure connectors to run remotely behind firewalls, instead of hosting them in Fusion. Also, some connectors support security trimming, which restricts query results based on user ID. In Fusion 5.9.0 and later, connectors use graph security trimming. In Fusion 5.8.1 and earlier, they use the security trimming stage.
Connectors are developed and released separately from Fusion, although their functionality and compatibility is closely tied to Fusion versions. Refer to the connector release notes for more information.