Re: WG: How to properly setup for snapshots

[Roman Mamedov <rm@romanrm.net>]

On Mon, 21 Dec 2020 12:05:37 -0500
Remi Gauvin <remi@georgianit.com> wrote:

> I suggest making a new Read/Write subvolume to put your snapshots into
> 
> btrfs subvolume create .my_snapshots
> btrfs subvolume snapshot -r /mnt_point /mnt_point/.my_snapshots/snapshot1

It sounds like this could plant a misconception right from the get go.

You don't really put snapshot* "into" a subvolume. Subvolumes do not actually
contain other subvolumes, since making a snapshot of the "parent" won't
include any content of the subvolumes with pathnames below it.

As such there's no benefit in storing snapshots "inside" a subvolume. There's
not much of the "inside". Might as well just create a regular directory for
that -- and with less potential for confusion.

* - keep in mind that "snapshot" and "subvolume" mean the same thing in Btrfs,
    the only difference being that "snapshot"-subvolume started its life as
    being a full copy(-on-write) of some other subvolume.

-- 
With respect,
Roman