Hello,
Looking at your responces,it apprears perhaps managment needs to give it a 
secound thought at backup level FULL, most places there should be no need 
to do that level everyday ( There could be exceptions)
secound you would perhaps slow your server down further if you added 
addtional Tape drive load to it, i am thinking there is enough Tape power 
( with multiplexing-allowed) to handle all your server load withen a given 
night, however your FULL schedule is placing extra load every night, not 
sure if you use GB ethernet or not, but that may help speed up the 
backups, perhaps additional storage node is a batter options in your case.
HTH

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