Backups: notify that credentials of remote backups are stored

Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

plinth/modules/backups/forms.py

@@ -104,8 +104,7 @@ class AddRepositoryForm(forms.Form):
         label=_('Encryption'),
         help_text=format_lazy(
             _('"Key in Repository" means that a '
-              'password-protected key is stored with the backup. <br />'
-              '<b>You need this password to restore a backup!</b>')),
+              'password-protected key is stored with the backup.')),
         choices=[('repokey', 'Key in Repository'), ('none', 'None')]
         )
     encryption_passphrase = forms.CharField(

plinth/modules/backups/templates/backups_repository_add.html

@@ -30,6 +30,15 @@
 
     {{ form|bootstrap }}
 
+    <div class="alert alert-warning" role="alert">
+      {% blocktrans trimmed %}
+      The credentials for this repository are stored on your {{ box_name }}.
+      <br />
+      To restore a backup on a new {{ box_name }} you need the ssh
+      credentials and, if chosen, the encryption passphrase.
+      {% endblocktrans %}
+    </div>
+
     <input type="submit" class="btn btn-primary"
            value="{% trans "Create Repository" %}"/>
     <a class="abort btn btn-sm btn-default"