Re: replicating backup servers offsite

On Fri, 2005-02-18 at 14:58 -0600, Carl Wilhelm Soderstrom wrote:
> I know people ask about this all the time; but I don't recall anyone
> actually mentioning how they went about it, and whether there were any
> pitfalls along the way.
> 
> If someone wants to replicate the backed-up data to another machine offsite;
> what's the best way to do this? (other than the removable-drive technique
> that Les uses... something fully automated).
> 
> My theory is to just do an rsync backup from the backuppc server to another
> box; but the problems I can see are:
> - if done with backuppc itself, this requires an extra step in the restore
>   process (restore the backup server, then do your restores from that).
> - rsync can crush a box to the point it can hang, if it's trying to index &
>   sync millions of files. (it did the time I tried to sync a backuppc pool
>   from one drive to another).
> 
> Has anyone done this? 
> 
I use LVM and snapshot the drive.  Then I use dd_rescue to copy it to a
removable hard drive in the same machine.  This copies the entire
partition, empty blocks and all, but I copy about 80Gb in 90 minutes.
'cp -a' takes many hours.   Of course this doesn't help much, because
it's not in a remote location.

I've seen reference to this trick, but never tried it:
tar cf - / | ssh -C host 'cd /mnt; tar -xf -'
I would think you would have to stop backuppc and unmount the drive for
this to be safe.

For a 'live' backup to a remote device, I've been considering the
'Enhanced Network Block Device'.  Again, haven't yet tried it.
http://www.it.uc3m.es/ptb/enbd/
Also, I don't know that it supports any kind of encryption.


--
Regards,
Rich

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