Background:
Networker Administrator since DEC NSR v 2.1
TSM user when it was still AdStar.

Opinion:
For my money, the issue isn't the backup so much as it is the recover.  
When the chips are down, I put my money on a smooth, successful recovery 
from Networker!

My experience with Networker is that I'm able to nwrecover to determine 
exactly which tape(s) will be needed to recover a server, disk, directory 
or file.  Then use mminfo to tailor my restore request to stream the data 
back to my server in an efficient manner.  (My 200 GB database restore took 
about 3 hours to recover from DLT tapes.)

With TSM, large data recoveries took large amounts of time as the TSM 
server had to cull through all of its records to locate all of the files 
required to complete the recovery.  In the late 90's it appeared that the 
more often the data had been "consolidated" the longer it took for TSM to 
compile a complete file list.  (In our testing, the complete recovery of 
one 9 GB disk took over 2 hours.)

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