phonic@phonic-photonic:~$ sudo -i
[sudo] password for phonic: 
root@phonic-photonic:~# blkid
/dev/sda1: LABEL="ESP" UUID="1DD3-C91D" TYPE="vfat" PARTUUID="f701c397-dd10-4c20-b370-9d0141e48335"
/dev/sda2: LABEL="Phonic-Photonic" UUID="b23155cb-7502-44d9-a45a-34f067c22be5" UUID_SUB="27314dab-d2d5-4e1c-82fe-d15af3e3f293" TYPE="btrfs" PARTUUID="4cc57166-f11c-41c6-abb5-3f8a1ea94b49"
/dev/sda3: UUID="014e68f6-1796-48e4-bf16-06ca72c24963" TYPE="swap" PARTUUID="a37cf33c-4b1b-43ea-8751-4c7fa6b380bd"
root@phonic-photonic:~# mount /dev/disk/by-uuid/b23155cb-7502-44d9-a45a-34f067c22be5 /mnt
root@phonic-photonic:~# vdir /mnt
total 0
drwxr-xr-x 1 root root 212 Jul 23 17:41 @
drwxr-xr-x 1 root root  32 Jul 23 17:38 @home
drwxr-xr-x 1 root root  60 Jul 23 17:35 ubiquity-apt-clone
drwxr-xr-x 1 root root   6 Jul 23 17:35 var
root@phonic-photonic:~# mkdir /mnt/snapshots
root@phonic-photonic:~# vdir /mnt
total 0
drwxr-xr-x 1 root root 212 Jul 23 17:41 @
drwxr-xr-x 1 root root  32 Jul 23 17:38 @home
drwxr-xr-x 1 root root   0 Jul 23 18:17 snapshots
drwxr-xr-x 1 root root  60 Jul 23 17:35 ubiquity-apt-clone
drwxr-xr-x 1 root root   6 Jul 23 17:35 var
root@phonic-photonic:~# btrfs su snapshot -r /mnt/@ /mnt/snapshots/@_basic_install_wUd
Create a readonly snapshot of '/mnt/@' in '/mnt/snapshots/@_basic_install_wUd'
root@phonic-photonic:~# btrfs su snapshot -r /mnt/@home /mnt/snapshots/@home_basic_install_wUd
Create a readonly snapshot of '/mnt/@home' in '/mnt/snapshots/@home_basic_install_wUd'
root@phonic-photonic:~#