Are you trying to recall the files and copy them? The "fancy" tools just copy the stubs - xcopy will recall the data. Depending on your DX settings the data will be read passed-thru or will end back up on primary storage. Is your destination the filer or just another LUN on a new filer?
RepliStor is stub-aware if you need to go down that road. The good thing about Replistor is that your cutover time will be minimal as it'll keep the source and destination synchronized (and yes you can have a NAS voume as a destination with Replistor).
Hope this helps