I don't have a 4000 but if it's anything like backing up files on an MV-8000, it takes a looooooooooooooooooooooooong azz time due to the USB1 connection.
Depending how much you have stored on the 4000's HD, it's probably best to take out the 4000's HD, put it in an external FW/USB case and back up your samples/projects to your MBP that way.






