Does the standard sleep options under windows 7 power management not suit, or not work? It would just go back to sleep after a few minutes of inactivity.
You can achieve this with Windows shutdown command, which can be executed against remote machines. There are a couple of tricks to making that work, but once you set it up, it works fine.
I had shutdown commands on my kids PCs but they knew how to override it, so I set up my server to remotely shut them down at predefined times. But I could have just as easily hibernate them rather than shut down.
Another way to do this, if the PC won't sleep automatically, is to execute this command from the media center PC..
rundll32.exe powrprof.dll,SetSuspendState 0,1,0
The trick is how to initiate it when the office PC has finished.
So, how do you control your file copying? is it done by a schedule? Is it random and dependent on some other criteria?