How do I copy one NAS drive to another, incrementally?

Hello - I have two 1tb Network Attached Storage devices on my Apple network.
I'm unsure how to make one a backup copy of the other. Tools used for cloning the Macintosh HD to a backup device (like Carbon Copy, Super Duper, Time Machine, Apple backup etc.) don't seem to allow me to make a copy of a NAS drive on a second NAS drive.
Does anyone have any ideas as to how I can do this please?
David.

Sorry to butt in, but could you explain this to me please. Typing rsync into the finder on my desktop finds no results. Is this a way of copying files without overwriting the files that are already the same?

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