Howto securely restore Jolla 1 to a previously created btrfs snapshot?
The snapshot was created under su-devel with:
# btrfs subvolume snapshot / /@/@/snap-2017-10-27-0228-520540643
An analoguous snapshot was also made for /home. The existing snapshots/subvols are now:
# btrfs subvolume list /
ID 259 gen 3748767 top level 5 path @swapu ID 264 gen 3748767 top level 5 path factory-@
ID 265 gen 3748767 top level 5 path factory-@home
ID 319 gen 4092792 top level 5 path @
ID 320 gen 4092792 top level 5 path @home
ID 325 gen 4003459 top level 319 path var/lib/machines
ID 327 gen 4003460 top level 319 path @home/snap-2017-10-27-0156-218109985
ID 328 gen 4006974 top level 319 path @/snap-2017-10-27-0228-520540643