Hi Sean,
Set virtual node in target node to be source node and when you run the
password that need to put will be the source node's passwd....
e.g. backup from Production client(node=prod,passwd=prod_tsm) to Acceptance
client(node=accpt, passwd=accpt_tsm) for testing the real  up to date data
purpose....
Set virtual node in dsm.opt ...(virtualnodename prod) in Acceptance to act
as it is the Production...and when it asked for client id put prod asked for
passwd put prod_tsm....
But if it is not normal filesystems backup..( e.g.tdpr3) you need to
configure adsmnode/nodename in configure files which has accpt as node or
client id)