dont refresh the backup page when there's an error saving the config

management/backup.py

@@ -384,7 +384,7 @@ def backup_set_custom(env, target, target_user, target_pass, min_age):
 	
 	write_backup_config(env, config)
 
-	return "Updated backup config"
+	return "OK"
 	
 def get_backup_config(env, for_save=False, for_ui=False):
 	backup_root = os.path.join(env["STORAGE_ROOT"], 'backup')

management/templates/system-backup.html

@@ -202,11 +202,12 @@ function set_custom_backup() {
       min_age: min_age
     },
     function(r) {
-      // Responses are multiple lines of pre-formatted text.
-      show_modal_error("Backup configuration", $("<pre/>").text(r), function() { show_system_backup(); }); // refresh after modal
+      // use .text() --- it's a text response, not html
+      show_modal_error("Backup configuration", $("<p/>").text(r), function() { if (r == "OK") show_system_backup(); }); // refresh after modal on success
     },
     function(r) {
-      show_modal_error("Backup configuration (error)", r);
+      // use .text() --- it's a text response, not html
+      show_modal_error("Backup configuration", $("<p/>").text(r));
     });
   return false;
 }