You are correct. When using client side encryption all the repeatable
patterns hardware compression works off of is removed therefore there is
nothing for the drive to compress. So you can end up using more tape
space. The only solution is to disable hardware compression or also
enabled client compression. NBU clients compress first then encrypt but
you take an even bigger hit in backup performance. 
Hope this helps,
Dan O

-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of James
Pattinson
Sent: Friday, May 22, 2009 8:39 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Encryption and compression

Hi All

Does anyone know if NetBackup's client encryption option compresses the 
data before it's encrypted?

If not am I right in assuming that this data won't be compressible even 
by hardware compression afterwards :)

Cheers
James
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