Thinking of this as the adult section of TSM discussions, I will say
that you can do what TSM will let you - which is to say, what makes
sense.

For example, if a given BAckup STGpool is already in progress, it
doesn't make sense for another to be accepted: attempting to start
another with the same source and destination storage pools results in
ANR2457E.  Attempting a Move Data for a volume already in use results
in ANR2420E.

TSM is rather like a dog, who will function as your faithful
companion, as long as you demonstrate awareness and forethought.

    Richard Sims