What is /var/lib/machines for?

[schul...@googlemail.com]

While trying to wrap my head around rolling back btrfs snapshots in dom0, I came across subvolume var/lib/machines whose parent subvolume is root. Could anybody please explain what this subvolume is for? Is it used at all? I'm asking because the Qubes VMs actually live in /var/lib/qubes.

Thanks,
Bodo

[Unman]

It's not Qubes related - it's for containers - systemd will look here
for nspawn, for example.

[schul...@googlemail.com]

Thanks for the quick answer!

Bodo