Usually you can use RoboCopy like this:
RoboCopy R:zS7-R2-W2K8R2-SP13R2DATA C:3R2DATA /e /zb /COPYALL /r:0 /w:0 /xJ
However, if you copy from one server to another, you will only copy directories. None of the files will be copied with this error message:
ERROR 1314 (0x00000522) Copying NTFS Security to Destination Directory . . .
A required privilege is not held by the client.
I found a simple way to fix this problem by changing /COPYALL to /COPY:DATSO like this:
RoboCopy R:zS7-R2-W2K8R2-SP13R2DATA C:3R2DATA /e /zb /COPY:DATSO /r:0 /w:0 /xJ
I do not recommend to use a /MIR switch, because it skips (or even modifies) security information on a destination machine.