Gavin,
Not all data is created equal. You might classify data which is super
important and changes often - it needs a lot of care and feeding. It is also
data which needs redundancy in backup hardware. Mail tends to be like that.
People get a message, read it and then delete it. The next day they go
looking for it. Even a daily backup may not catch the message if the user
deleted the message withing the day.
Then there is data which does not change often, lingers around for a long
time, like user files. And we can be more sloppy with safeguarding it.
Meaning, if the backup lives on a cheap RAID 0 array (e-sata array), and the
whole array goes south. You can start another backup in the background and
hope in the mean time the original stays stable - you can recover.
Bacula allows you to have multiple storage locations, each running a sd.
This divorcing of one type of data from another has other benefits - similar
to having multiple smaller volumes versus a few big ones. If one volume gets
corrupted, it affects a smaller set of data. Spend the money where you
really need to spend it.
Yudhvir
===
On Mon, Jul 13, 2009 at 4:04 AM, Gavin McCullagh <gavin.mccull...@gcd.ie>wrote:
> One server has about 300GB of data. We keep 31 consecutive days and the 1st
> of each month prior to that. This costs us about 450GB of disk space.
>
> I'm now looking at setting up bacula for this backup -- initially using
> disk storage. As a starting point, looking at chapter 25 of the manual, it
> would cost about (300GB*6)*(compression ratio) just for the full backups
> which is a little rough and probably involves a very large amount of
> redundancy. While SATA disks are pretty cheap, caddies for our Dell MD1000
> disk array aren't :-(
>
> To try and reduce the space requirements, I'm considering more spread out
> schemes ...
>
>
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