all:
  vars:
    ansible_user: ansible
    ansible_become: yes
  children:
    function:
      children:
        backup_server:
          hosts:
            myFirstGentooHost.example.org:
    os:
      children:
        os_gentoo:
          hosts:
            myFirstGentooHost.example.org:
            mySecondGentooHost.anotherexample.org:
        os_debian:
          hosts:
            myFirstDebianHost.example.org:
            mySecondDebianHost.anotherexample.org: