[PVE-User] vzdump: backup kvm lvm2 vm. Full backup ok, differential ?

Gilles Mocellin gilles.mocellin at free.fr
Wed Oct 6 23:48:41 CEST 2010

Le mercredi 06 octobre, Martin Maurer écrivit :

> Hi,
> vzdump is designed for full backups. If you need differential/incremental backups you should use a "traditional" backup tool.
> Br, martin
> > -----Original Message-----
> > From: pve-user-bounces at pve.proxmox.com [mailto:pve-user-
> > bounces at pve.proxmox.com] On Behalf Of dea
> > Sent: Mittwoch, 06. Oktober 2010 18:17
> > To: pve-user at pve.proxmox.com
> > Subject: [PVE-User] vzdump: backup kvm lvm2 vm. Full backup ok,
> > differential ?
> > 
> > 
> > Hi all !
> > 
> > I've a big problem.
> > 
> > vzdump after LVM2 snapshot create a "dd" image of KVM container, perfect
> > for full backup, but is there a solution for differential backup ?
> > 
> > I use an history, use different versions of the same container. This is a huge
> > waste in terms of (backup) space used.
> > 
> > The solution would be a special "differential dd"....

I wonder some times ago if full uncpompressed (or gzipped with
--rsyncable) backup on a deduplicated filesystem can save much space.

But :
- I don't have a NetApp NAS or other storage that suports deduplication
- I still haven't had time to test SDFS (http://opendedup.org/) or lessfs (http://www.lessfs.com/).

A traditionnal backup like bacula is certainly a better long term
solution. Same way to backup physical servers and virtual ones.

You can have two different backup styles :
- Full backup for disaster recovery, from scratch.
For that, you can use vzdump, even launched from a traditionnal backup
- Incremental backup, from inside the VMs with a traditionnal backup
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