losing connection to network device

I have a usb external drive attached to a computer on the network.  I'm trying to restore a backup currently on the external usb drive to a NAS.  The NAS is visible on the network, shows an ip address & name on the server, but during the copy process I lose connection with the NAS.

The NAS (or subdirectories of it) are then invisible in Windows Explorer.  Or I get a message that I don't have rights to the NAS.

If I close everything down and open it back up I can see my dives & directories.  But when the copy process starts again, it may run for a few minutes, but eventually loses connection again.

With 2TB to restore, this may take 6 years  :-(

ideas?
rrl22Asked:
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Glyn MerrittIT Project ManagerCommented:
Can other computers on the network access the NAS when the copy fails? I have experienced temporary NAS failures while transferring large amounts of data to them.
The best way to kick off a copy with that amount of data would be using robocopy.
Download: http://www.microsoft.com/download/en/details.aspx?id=17657
Copy out the robocopy.exe file to an easy location to access with command and tap in the source and destnation
Use the /MIR command and it will copy the source to the destination as a mirror image and you can kick it off again if it fails
/MIR to be used care though as it will delete any existing file not originating from the source in the destination.
robocopy f:\backupfolder "\\nas\DestinationFolder" /MIR /r:0 /w:0 /FFT
/R:n : Number of Retries on failed copies - default is 1 million.
/W:n : Wait time between retries - default is 30 seconds.
/MIR : MIRror a directory tree - equivalent to /PURGE plus all subfolders (/E)

/FFT : Assume FAT File Times (2-second date/time granularity, needed for some NAS drives)

You will see the files copying as they go and if the NAS fails you can kick it off again and it will only copy files it has not yet completed. Check the details when the copy has completed so to ensure no files have been missed.
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