It's not about snapshots but here is an other incremental
backup recipe for optical mediums like DVDs, BlueRays:
Base Backup:
1) Create encrypted loopback devices of DVD or BlueRay sizes.
2) Create a compressed multi device Btrfs spanning these
loopback devices. (To save space, you may use single
metadata if this is not your only backup)
3) Rsync your data into this fs.
4) Unmount it and make it SEED fs (btrfstune -S 1..)
5) Burn loopback device files to DVDs, Bluerays.
Incremental Part:
a) Before your next backup, create additional encrypted
loopback devices as needed.
b) Mount your base backup. (It will mount as read-only)
c) Add devices created at (a) to your base backup fs.
d) Rsync into your fs. (Note that incremental data
will only go into the devices at (a)
e) Unmount all.
f) Only burn devices at (a) to DVDs, Bluerays. These
are your incremental disks.
Regards,
Imran
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