I do on Win2K Box :
More than 650 Completed backup Win9x, NT, 2K Clients backup / days
More than   80 NT/ 20 Unix Completed Backup / days
10 Exchange Servers

Volume by day 100-300 GB

It works fine used less than 50% CPU at maximum. 
Server : HP LXr8500 8x PIII 700 2MB, 4GB Ram, 24x18GB Ultra3 Raid 5 Disk,
1Gb/s NetCard.
Library : STKL700, 6xLTO Ultrium.

The main advantage of Win2K Platfom is the cost of the Hardware comparing to
SUN or AIX box.

Salutations / Best Regards 
g            GE Medical Systems 
___________________________________________ 
Eric Boireau                               Global Systems 
Server Architect / Technology & Infrastructure Team

GE Medical Systems S.A 
283, rue de la Minière 
78533 BUC Cedex France 
Tél: (33) 1 30 70 39 32,  DC: 8*644 3932 
Fax: (33) 1 30 70 42 30, DC: 8*644 3930 
mailto:Eric.Boireau AT med.ge DOT com