Hetzner/popeye/llanura14Backup.sh

#!/bin/sh
ZROOT_BASE="zroot"
SSH="/usr/bin/ssh"
ZFS="/sbin/zfs "
REMOTE="davidmarec.ddns.net"
REMOTE_USER="david"
REMOTE_KEY=~david/.ssh/id_ed25519
REMOTE_POOL="dmarec/popeye"


failure() 
{
	echo ${@}
	exit 1
}

ssh-add ${REMOTE_KEY} || failure 'ssh-agent required.'

# getting last snapshot id
# if one cannot trust the snap id one can use creation time

for i in usr JAILS

do
	ZROOT="${ZROOT_BASE}/${i}"
	ZLAST=`${ZFS} list -o name -Hp -t snap -d 1 ${ZROOT} | cut -d '@' -f 2 | sort | tail -1` 
	echo '---------------------------------------------------'
	echo "sending backup ${ZROOT}@${ZLAST} to ${REMOTE_POOL}"
	echo
	${ZFS} send -R -e -L -c ${ZROOT}@${ZLAST} | \
		${SSH} -i  ${REMOTE_KEY} ${REMOTE_USER}@${REMOTE} \
		${ZFS} recv -Fdu -o canmount=off -x mountpoint -x logbias -x dedup -x copies ${REMOTE_POOL}
	echo '^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^'
done