I am looking for information on how to design networ backup infrastructure. one 
 can use network server  for a certain number of c clients, as well we can 
configure storage nodes for the same client instead. 

What I am interested is when we have to use storage node? Is it in connection 
with a sort of parralelism  such Client, Server and Seva Set? Together with a 
amount of data to be backed up.

Let say tat there is one  jukebox (one with two heads - tweo tape drive) to be 
used.

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