nas ~ # for i in $( ls /mnt/current_backup_file/ | grep backup); do btrfs property set -t s /mnt/current_backup_file/$i ro true; done
nas ~ # btrfs send -v /mnt/current_backup_file/backup-2011.11.07-22\:43/ | btrfs receive -v /mnt/btrfs-brot-backup-subvol/
At subvol /mnt/current_backup_file/backup-2011.11.07-22:43/
At subvol backup-2011.11.07-22:43
receiving subvol backup-2011.11.07-22:43 uuid=9c52dfc1-499f-9640-a4f9-0f8b89974a61, stransid=0