Why does persistent cache enable the Radiology group to maintain their changes?

Persistent cache, by definition, retains all user-specific changes, application installations, and data modifications made within the virtual desktop across reboots and logoff/logon sessions. This ensures users find their desktops in the same state they left them.

While persistent caches may eventually be backed up, the act of being backed up is not what defines its persistence; persistence refers to the survival of data across restarts.

The storage location, whether cloud-based or on-premises, does not fundamentally determine if a cache is persistent; persistence is about data retention across sessions.

Encryption with EFS (Encrypting File System) is a security feature that protects data confidentiality, but it does not enable the cache to maintain changes across restarts; that is a function of its persistent nature.