groups/all: do backups

.. except for a couple of nodes which hold no important data

groups/all.py

@@ -2,8 +2,13 @@ groups['all'] = {
     'member_patterns': {
         r".*",
     },
+    'subgroups': {
+        # This is only needed because we're overriding stuff in the group.
+        'home',
+    },
     'bundles': {
         'apt',
+        'backup-client',
         'cron',
         'hostname',
         'postfix',
@@ -19,6 +24,9 @@ groups['all'] = {
                 'mail': 'hostmaster@kunsmann.eu',
             },
         },
+        'backup-client': {
+            'server': 'franzi-home.kunbox.net',
+        },
     },
     'pip_command': 'pip3',
 }