>I need some help how to implement progressive backups for backing up TSM
>clients' data.

Progressive, incremental backups are intrinsic to the product.
In that you're asking fundamental questions, I would guess that you haven't
been through a lot of the introductory material about the product.
Review the TSM Concepts redbook and the Admin Guide manual, both of which
provide a solid overview of how the product works.
You might also view the Flash-based demo of how the product works at:
http://www.ibm.com/software/tivoli/library/demos/storage-mgr.html

   Richard Sims,  http://people.bu.edu/rbs