1.  What are the clients and client software levels?

If there are a number of Win2K clients running at least TSM 3.7.2, changing
the server from 3.1 to TSM 4.1 turns on the support for "SYSTEM OBJECT"
backups, which causes most of the .dll and .exe files in the
Windows/system32 directory to be backed up every day, whether changed or
not.  It's about 200MB per client per day additional, IF you have
compression turned on, more without compression.  We have 200+ Win2K
clients;  caused us a significant increase in the amount of data per day,
plus significant growth of the TSM data base..

2.  Don't know

3.  1 implies 3

4.  2 will cause 4