roundcube: Enable backup/restore (no data)

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

functional_tests/features/roundcube.feature

@@ -15,7 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-@apps @roundcube
+@apps @roundcube @backups
 Feature: Roundcube Email Client
   Run webmail client.
 
@@ -32,3 +32,10 @@ Scenario: Disable roundcube application
   Given the roundcube application is enabled
   When I disable the roundcube application
   Then the roundcube site should not be available
+
+Scenario: Backup and restore roundcube
+  Given the roundcube application is enabled
+  When I create a backup of the roundcube app data
+  And I export the roundcube app data backup
+  And I restore the roundcube app data backup
+  Then the roundcube site should be available

plinth/modules/roundcube/__init__.py

@@ -24,7 +24,7 @@ from plinth import service as service_module
 from plinth import action_utils, actions, frontpage
 from plinth.menu import main_menu
 
-from .manifest import clients
+from .manifest import backup, clients
 
 version = 1
 

plinth/modules/roundcube/manifest.py

@@ -18,6 +18,7 @@
 from django.utils.translation import ugettext_lazy as _
 
 from plinth.clients import validate
+from plinth.modules.backups.api import validate as validate_backup
 
 clients = validate([{
     'name': _('Roundcube'),
@@ -26,3 +27,5 @@ clients = validate([{
         'url': '/roundcube'
     }]
 }])
+
+backup = validate_backup({})