How can I configure my USB harddrive as backup medium for ntbackup on
windows 2003 server ?

I assume I have to define the device for usage within ntback somewhere
within remote storage, but I can't find where.

After defining the device, should I be able to select the USB drive as
backup destination, next to the default 'file' destination in ntbackup ?

Also, I want to use the USB harddrive for creating my ASR backup. Will I be
able to use the USB drive to restore the ASR afterwards ?