# Only readonly filesystems can be sent/received
# btrfs send /mnt/sda10_btrfs_id5/snapshots/base_yyyy-mm-dd_mm\:ss_r/ | btrfs receive /mnt/T180904p2/sda10/snapshots/
# btrfs send /mnt/sda10_btrfs_id5/snapshots/dnld_yyyy-mm-dd_mm\:ss_r/ | btrfs receive /mnt/T180904p2/sda10/snapshots/
# btrfs send /mnt/sda10_btrfs_id5/snapshots/logs_yyyy-mm-dd_mm\:ss_r/ | btrfs receive /mnt/T180904p2/sda10/snapshots/