<https://forums.FreeBSD.org/threads/what-is-the-proper-way-to-take-snapshots-and-do-rollbacks-of-zroot.61297/>
<http://schema.org/interactionStatistic>
<https://forums.freebsd.org/threads/what-is-the-proper-way-to-take-snapshots-and-do-rollbacks-of-zroot.61297/>