Re: [Qemu-devel] [Qemu-block] [RFC] Differential Backups

[Stefan Hajnoczi]

On Wed, Apr 29, 2015 at 06:51:08PM -0400, John Snow wrote:
> This is a feature that should be very easy to add on top of the existing
> incremental feature, since it's just a difference in how the bitmap is
> treated:
> 
> Incremental
> - Links to the last incremental (managed by libvirt)
> - Clears the bitmap after creation
> 
> Differential:
> - Links to the last full backup always (managed by libvirt)
> - Does not clear the bitmap after creation
> 
> No biggie.

Differential backups can be done using incremental backup functionality
in QEMU:

The client application points QEMU to the same target repeatedly instead
of keeping separate incremental backups.

Stefan

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