Secure Copy is a UNIX standard used to transfer files from one computer to another. He's how to use the function in macOS, all via the Terminal window.

When you cannot copy data from remote desktop to local machine, it is associated with the RDP clipboard settings. You can fix it with these solutions.

A full review of the DS920+ is coming soon. However, upon receiving the new unit, my issue was how to copy across the data from the old NAS to the new one.