DragonFlyBSD - Hammer2 snapshot first steps

I am running DragonFlyBSD for quite some time now, but I never took the time to explore how Hammer2 really works concerning its snapshot abilities. This post is my first try at it and I intend it to be a little memo. First let’s gather some info about our mounted filesystems. $ mount | grep hammer2 serno/QM00005.s1d on / (hammer2, local) /dev/serno/QM00005.s1e@DATA on /build (hammer2, local) There are 2 different mountpoints interesting for us : / and /build.