# stop openhab instance (here: systemd service)
sudo systemctl stop openhab2.service

# backup current installation with settings
TIMESTAMP=`date +%Y%m%d_%H%M%S`;
mkdir  ~/openhab2-backup-$TIMESTAMP
cp -arv /etc/openhab2 ~/openhab2-backup-$TIMESTAMP/conf
cp -arv /var/lib/openhab2 ~/openhab2-backup-$TIMESTAMP/userdata

# restart openhab instance
sudo systemctl start openhab2.service