Ryan Novosielski wrote:
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> 
> Hemant Shah wrote:
>>
>> --- On Thu, 9/4/08, Chad Netzer <chad.netzer AT gmail DOT com> wrote:
>>
>>> From: Chad Netzer <chad.netzer AT gmail DOT com>
>>> Subject: Re: [Bacula-users] How much space does Bacula need?
>>> To: "Ryan Novosielski" <novosirj AT umdnj DOT edu>
>>> Cc: bacula-users AT lists.sourceforge DOT net
>>> Date: Thursday, September 4, 2008, 6:46 PM
>>> On Thu, Sep 4, 2008 at 11:42 AM, Ryan Novosielski
>>> <novosirj AT umdnj DOT edu> wrote:
>>>> Hemant Shah wrote:
>>>>> You should always let the tape drive do the
>>> compression, the hardware compression on tape will be faster
>>> then software compression done by the client. Your backups
>>> will be faster too.
>>>> Unless you're not using a tape, which is why I
>>> compress in software. :)
>>>
>>> Or if you are using bacula to encrypt the data on each
>>> client before
>>> sending it to the storage daemon.  Tape compression is
>>> practically
>>> useless for already encrypted data.
>> Why would it be useless for encrypted data? It is not compressed unless you 
>> encrypt and compress on client.
> 
> I think -- and now I'm pretty sure this depends on your tape hardware as
> some of them are a lot better than others -- that encrypting something
> tends to randomize it so much that it becomes incompressible.

Agreed.

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