Prime Collaboration Deployment has an embedded SFTP Server (used for image transfers). Some customers use that SFTP Server for backup/restore image storage as well if the PCD VM’s vDisk is big enough.
I don’t think the PCD VM’s SFTP Server exposes a shell CLI though, if that’s what you need.
I don’t have the Customer Care/Contact community link handy, but a post in there would help too.
-james