Dan Langille wrote:
> 
> On Feb 18, 2008, at 1:01 PM, Tom Allison wrote:
> 
>> Way back when I had some tape drives. At that time Linux could not
>> provide compression on tape drives. Especially if you where trying to
>> write across multiple tapes.
>>
>> Is this still true?
>>
>> So if I'm looking at a tape drive that says it is an 80/204GB type, I
>> should use 80GB for my calculations?
> 
> Compression is a hardware issue.  It is not done by the OS.
> 
> What calculations?
> 

So I can expect that whatever is under the hood for Bacula to get me 
some compression (I agree with the 1:1.5) for the tape drive.

I'm trying to see how much space I need to back up three macbooks and 
three debian servers.  Using my own macbook as the worse case situation 
I have 20GB in $HOME, 21GB in /opt, and 66GB used in total.

Sorting out junk and stuff that I can reinstall via ports, I have 
40-50GB of usable space that I'll eventually need to keep backed up.

As a guess I assumed 1.5 to 2.0 times more space in a backup of said 
computer.  So this means I should have ~80GB for one macbook.  Something 
like that.

Those calculations?

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