---

- hosts: all
  gather_facts: no

  tasks:
  - name: Check if directory /home/back exists
    stat:
      path: /home/back
    register: home_back

  - name: Set correct group recursivly for directory /home/back
    file: 
      group: back
      path: /home/back
      recurse: yes
    when: home_back.stat.exists