John Abreau wrote:
It occurs to me that I'm thinking of LVM snapshots, and I'm assuming btrfs
is a filesystem that has LVM-like functionality baked in.

That's correct.

Btrfs snapshots, like LVM and ZFS and Advfs and XFS and AFS snapshots all reside on the same medium as the original. Btrfs and Linux LVM are the odd ducks here being the ones that lack a native mechanism for replicating snapshots to other media.

--
Rich P.
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