diff --git a/roles/ldap_server/molecule/default/prepare.yml b/roles/ldap_server/molecule/default/prepare.yml
index 53a41ad097f7ba71e05380e927379daa31c17ecb..9f733d49f5f2769e874ce7ca66862f6b40380f0a 100644
--- a/roles/ldap_server/molecule/default/prepare.yml
+++ b/roles/ldap_server/molecule/default/prepare.yml
@@ -2,21 +2,21 @@
 
 - name: Prepare
   hosts: all
-  gather_facts: False
+  gather_facts: false
   tasks:
     - name: Install python for Ansible
       raw: test -e /usr/bin/python || (apt -y update && apt install -y python-minimal)
-      become: True
-      changed_when: False
+      become: true
+      changed_when: false
 
 - hosts: all
-  become: yes
+  become: true
   tasks:
 
     - name: Update all caches to avoid errors due to missing remote archives
       apt:
-        update_cache: yes
-      changed_when: False
+        update_cache: true
+      changed_when: false
 
     - name: Deploy CA certificate
       copy:
@@ -27,16 +27,16 @@
         mode: 0644
 
 - hosts: client
-  become: yes
+  become: true
   tasks:
 
     - name: Install tool for teting TCP connectivity
       apt:
         name: hping3
-        state: installed
+        state: present
 
 - hosts: parameters-optional
-  become: yes
+  become: true
   tasks:
 
     - name: Set-up the hosts file
@@ -52,7 +52,7 @@
         127.0.2.1: parameters-optional
 
 - hosts: parameters-mandatory
-  become: yes
+  become: true
   tasks:
 
     - name: Set-up the hosts file
@@ -66,3 +66,24 @@
         state: present
       with_dict:
         127.0.2.1: parameters-mandatory.local
+
+- hosts: backup-server
+  become: true
+  roles:
+    - role: backup_server
+      backup_host_ssh_private_keys:
+        dsa: "{{ lookup('file', 'tests/data/ssh/server_dsa') }}"
+        rsa: "{{ lookup('file', 'tests/data/ssh/server_rsa') }}"
+        ed25519: "{{ lookup('file', 'tests/data/ssh/server_ed25519') }}"
+        ecdsa: "{{ lookup('file', 'tests/data/ssh/server_ecdsa') }}"
+      backup_clients:
+        - server: localhost
+          ip: 127.0.0.1
+          public_key: "{{ lookup('file', 'tests/data/ssh/parameters-optional.pub') }}"
+
+- hosts: parameters-mandatory,parameters-optional
+  become: true
+  tasks:
+
+  - name: Rename the ss utility (see https://github.com/philpep/testinfra/pull/320)
+    command: "mv /bin/ss /bin/ss.bak"