Exchange provides an API to the backup vendors.  This API only does FULL,
Incremental, and Differential.  It has nothing to do with TSM that it backs
the whole thing up everytime.  Exchange is just a piece of crap on
supporting backup and recovery.  You have to think of it as a database and
not a file system.  Databases just typically backup the whole thing and then
do incremental logs.

Welcome to Exchange.  You are lucky, many exchange users have to keep their
backups for 1 year or forever.

Paul D. Seay, Jr.
Technical Specialist
Naptheon, INC
757-688-8180