Comment # 13 on bug 960074 from Matthias Sch�nemann

(In reply to Michael Chang from comment #12)

> ...
> Initially it excludes any subvolume that is of type snapshot or readonly.
> But you really can do "rollback to a snapshot" or even "installation to a
> snapshot" (to manage all your system states as snapshots in chronological
> order and also allow to delete it) then your default subvolume becomes a
> snapshot. That os-prober fixes the problem of default subvolume as a
> snapshot.

I don't get that. How can I do a "rollback to a snapshot" or an "installation
to a snapshot" and so on? Is there a way to boot from an old snapshot in the
broken installation? Can you post a link to a "howto" or give a brief
description?