[PVE-User] backup archive size

[Eneko Lacunza]

Hi,

Backup compression is done on a block level (there is no filesystem 
knowledge), so you can have "dirty" blocks in the virtual device that 
don't compress well, although you guest filesystem knows they're free.

On 18/09/14 09:52, Tonči Stipičević wrote:
> Hello to all
>
> I have one VM win2012r2 with two virtio qcow2 disks  .
> 1st one is 100G big with 20G data on it.
>
> I'm backing only this partition up , 2nd one has "no-backup" flag,
> and backup archive turnes out to be 72G big  .
>
> How is that possible since I have "only"  20G  of data ?
>
> Thank you very much in advance and
>
> BR
>
> Tonci Stipicevic
>
> //
>
>
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