On Wed, Sep 09, 2009 at 09:33:03AM +0200, Christian Völker wrote:
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> Hi,
> 
> as I have the same issue with storing my BackupPC outside I tried
> another way the last days:
> 
> First, my environment:
> 28 hosts to back up. Mostly idle machines with minor services (so no big
> databases and so on). Partially fileserver with only little daily
> changes. So I expected not too much daily changes on the pool.
> I want to copy the pool to a remote location after testing is done.
> 
<snip>
> So what does this mean to me?
> 
> Looks like on my pool BackupPC changes approx two third of the whole
> pool daily. So if I would transfer to a remote site I'd need to transfer
> 300GB daily!
> 
> Can anyone confirm BackupPC changes so many data inside the pool DAILY?
> 
> I can't imagine the backed up data itself is 300GB!

I used LVM snapshots to see how much data changes. Put your BackupPC volume
on an LVM logical volume, let it come to some stable state (disk usage
+- doesn't change anymore), stop backuppc, umount, take an LVM snapshot,
mount, start backuppc, and periodically check lvdisplay to see how
much % of your snapshot is filled. It should give a good idea of how much
data changes. On your setup with >300 home directories, and as much mysql and
pgsql databases, resulting in a pool of 334GiB, +- 1-3GiB changes daily.

-- 
Pieter

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