Why not create a new primary pool, and back it up to the new copypool?  The
old copypool will still be there, and the new one will get the new data.
Then you can, at your own speed, move data from the old primary pool to the
new primary pool, and it will delete from the old copypool and get copied
to the new pool when you backup those storage pools.  TSM will track the
files wherever they go, and you can control how hard your tape devices get
hit.

Nick Cassimatis
nickpc AT us.ibm DOT com