I have a task scheduled to back up my data overnight to a networked
NAS unit. It's a simple Robocopy script, and it works fine. Perhaps
the problem is you haven't set the task properly? The structure of the
Robocopy script is:
Robocopy B:\ \\NAS-name\home\GB\B-backup /MIR /R:1 /W:1 /A-:S /A-:H
(where home\GB is the location set up on the NAS)
repeated for each disk to be copied.
These are all included in a *.bat file, called from the task
scheduler.