sudo rsync -aAXv / --delete --ignore-errors --exclude={"/dev/*","/proc/*","/sys/*","/tmp/*","/run/*","/mnt/*","/media/*","/lost+found"} /mnt/full/prime

sudo apt-get install ssh rsync

ssh-keygen
ssh-copy-id ~/.ssh/id_rsa.pub prime

mkdir /mnt/full/solar
ssh solar
sudo rsync -aAXv / --delete --ignore-errors --exclude={"/dev/*","/proc/*","/sys/*","/tmp/*","/run/*","/mnt/*","/media/*","/lost+found"} pi@prime:/mnt/full/solar

sudo rsync -e 'ssh -i /path/to/pi's/id_rsa' -aAXv / --delete --ignore-errors --exclude={"/dev/*","/proc/*","/sys/*","/tmp/*","/run/*","/m‌​nt/*","/media/*","/l‌​ost+found"} pi@prime:/mnt/solar