>>
>> What about when you are encrypting? You have to do the compression in
>> Bacula as once you've encrypted the data it can no longer be compressed
>> by the drive (eg for LTO < LTO4 where the drive cannot encrypt.)
>
> Encryption programs generally compress as well in order to increase 
> entropy - so any external compression routines will just make things 
> slower for no gain.
>

Thanks Alan,

I am specifically addressing the encryption support within Bacula:

http://www.bacula.org/en/dev-manual/main/main/Data_Encryption.html

Does this pre-compress the data, thus rendering the separate compression 
redundant? If so, it would be great and probably save us loads of time 
(about 1 week to back up about 18TB).

Cheers

Alex

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