Hi, I've a Raspberry PI running Raspbian with one harddisk with brtfs. /dev/sda it contains 2 subvols backup photos and they are mounted as: /mnt/backup /mnt/photos the top volume isn't mounted. As this disk is almost full I want to add an extra disk. Questions: 1) how to add an extra disk? (every where it is mentioned to add it to mount but thats always for a volume without subvols and always with eg /dev/sda mounted, which isn't the case now) 2) does it remember this extra disk after reboot or do I need to add something to fstab?