The Why questions aside (as in "Why do this with TSM - it's not like other
backup products that need a full backup?"), I'd recommend doing the weekly
full backups under a different node name.  To do a full box restore, you
restore the full backup from the new node name, then the incrementals from
the regular, nightly backups.  This way you don't mess with the historical
versions on the regular nightly's (basically, the "old" SLA).

Nick Cassimatis
nickpc AT us.ibm DOT com

Think twice, type once.