backup_mac.sh

backup(){
  # target sink
  local target="${1:-"/Volumes/${YOUR_VOLUME}"}"

  # target sources
  local sources=$HOME

  # check volume mounted
  if mount | grep -q "on ${target}"; then
    rsync -havP --exclude={Desktop,Downloads,Library,Movies,Pictures,Public,.Trash} \
          ${sources} ${target}
  else
    echo "Could not find ${target} in /Volumes."
  fi
}