[Service]
Type=oneshot
ExecStart=/usr/bin/btrfs subvolume delete /.@/%i-weekly-3
ExecStart=/usr/bin/mv /.@/%i-weekly-2 /.@/%i-weekly-3
ExecStart=/usr/bin/mv /.@/%i-weekly-1 /.@/%i-weekly-2
ExecStart=/usr/bin/btrfs subvolume snapshot -r %I /.@/%i-weekly-1