There was a discussion in September that may help you,
visit the archives at  http://search.adsm.org/  and search for "would you buy
tsm again"

On Friday, November 03, 2000 4:58 AM, Klatt, Michael
[SMTP:KlattM AT EUROPE.STORTEK DOT COM] wrote:
> http://www.keylabs.com/results/veritas/veritas.html
>
> Gru?
> Michael
>
> -----Ursprungliche Nachricht-----
> Von: Sixbury, Dan [mailto:dsixbury AT SAINT-LUKES DOT ORG]
> Gesendet am: Donnerstag, 2. November 2000 19:55
> An: ADSM-L AT VM.MARIST DOT EDU
> Betreff: Tivoli TMS (ADSM) vs Veritas Netbackup
> Vertraulichkeit: Vertraulich
>
> We are currently trying to decide between using Veritas Netbackup and Tvioli
> Management System (ADSM).
>
> Does anyone know of pros or cons of using one over the other?  If you don't
> know about the other product, is there anything that you have experienced
> that made you wish you had chosen a different backup software solution?
>
> Thank you.
>
> Dan