CDP Data Centers provides the ability to assign certain Users to CDP Server Cluster Nodes. For example, a customer can belong to a CDP Server. To link Users to a certain CDP Server Node, you should assign these Users to the Volume that is linked to the Storage Pool of the necessary CDP Server.
Read more in Linux Control Server - Volumes.
You can assign a User to only a certain Host. See Host Administrator.
The customers (Users) of Backup services log in to the Web Server. Users can have access only to the Volumes, Hosts, and/or Users assigned to them.