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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.

- --
 ---- _  _ _  _ ___  _  _  _
 |Y#| |  | |\/| |  \ |\ |  | |Ryan Novosielski - Systems Programmer II
 |$&| |__| |  | |__/ | \| _| |novosirj AT umdnj DOT edu - 973/972.0922 (2-0922)
 \__/ Univ. of Med. and Dent.|IST/AST - NJMS Medical Science Bldg - C630
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