As a matter of interest, 

I have found that "generally" around the 4 or 5 // per drive is a good average 
between decent backup performance and a acceptable restore speed (in most of 
our environments).

Depending on the number of clients being backed up at any given time - I 
normally try and keep the client // relatively low (2). IF there is a issue 
with specific clients having horrid throughput's I try and isolate them 
separately.

The server // is then dependant on the number of drives you have (i.e. you set 
the server // to that. Remember that if you only have 1 drive and a server // 
of 16 - you will be backing up 16 sessions to tape as server over rides tape 
//).

Obviously in the larger environments you need some decent CPU / more drives / 
more memory.

I have seen before that having wrong drivers / network cards have chewed up CPU 
on systems.

Regards,
Riaan

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