The only thing I can think of would be to kill the client scheduler service
when you want the backup to stop.  On Unix, you'd have to find the process
number of the TSM scheduler and kill that process.  On NT, you could have
an "at" command do a NET STOP "TSM Scheduler Service" (whatever you called
the scheduler service) at the time you want the backup to end.  In both
cases, you'll have to restart the scheduler service, outside of the backup
window, for the next nightly backup to work.

The problem is that TSM follows the same order in the backup every time, so
the data at the end of the backup sequence may never get backed up.  If
that's a risk you're willing to take, the above methods should work.

Nick Cassimatis
nickpc AT us.ibm DOT com