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I want to generate a /usr/local/etc/backuppc/hosts with all hosts from the ansible inventory, but exclude a group.

Inventory:

[dbservers]
db1
db2
db3

[DisableBackup]
db3

hosts.j2:

# {{ ansible_managed }}

{% for hosts in groups['all'] | difference(groups['DisableBackup']) %}
{{ hosts }}
{% endfor %}

tasks/generate_hosts.yml:

  - name: Generate hosts file
    template:
      src: hosts.j2
      dest: "{{ backuppc__confdir }}/hosts"
      owner: "{{ backuppc__user }}"
      group: "{{ backuppc__group }}"
      mode: 0644
      force: yes

Run:

ansible-playbook -i inventory install_backuppc.yml

Result:

cat /usr/local/etc/backuppc/hosts
# Ansible managed
db1
db2

Source.