Not sure since when this became available. Just noticed this option when cloning LXC container. If you have CEPH setup done like i do, you should have an option to snapshot LXC containers. And later you can clone that LXC container from specific snapshot. This way is much easier to test different versions of running software instead of restoring from snapshot on it self. This feature is such a time saver for me ... i don't know how i managed without it.
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