Maybe already obvious, but in case you didn't read the fine print in the 
Networker docs I'll repeat it here:

You can do Networker-based data compression, or Networker-based data 
encryption, but not both.

I'd like to return to Networker compression of data (I could backup all of my 
systems direct to disk again) and use encrypting tape drives, but as pointed 
out earlier, the key management system(s) may be a costly proposition for a 
smaller shop.

And, whatever key management approach you use it has to be 100% available and 
working at your offsite disaster location(s).

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