On Monday 2017-11-20 11:45:09 Bill Arlofski wrote:
[...]
> Using a Runscript (with RunsWhen=before), you can have small script to
> tell the KVM hypervisor to perform a snapshot of a particular VM. Then,
> once the snapshot is complete, the job would backup the VM's config and
> disks, then in a second RunScript in the same Job configuration (with
> RunsWhen=after) the snapshot could be automatically removed.

He is using qcow2 format.
I didn't use it for the last five years but back then creating and
removing snapshots with qcow2 was done inside the same image file
and by removing the snapshot the used space wasn't freed once it was
allocated.

I don't know if that changed over the last five years but it would
be a good idea to test it before putting it into production and
automation.

-- 
Josip Deanovic

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