diff --git a/server/plugins-available/backup_plugin.inc.php b/server/plugins-available/backup_plugin.inc.php
index 3c3531c8077b1ba32a6dfd58d8b6237b6bc0a177..5b46930b10dc1a3eac068a6316b005c5a8ee195b 100644
--- a/server/plugins-available/backup_plugin.inc.php
+++ b/server/plugins-available/backup_plugin.inc.php
@@ -156,6 +156,7 @@ class backup_plugin {
 						}
 					}
 				}
+				if( $server_config['backup_dir_is_mount'] == 'y' ) $app->system->umount_backup_dir($backup_dir);
 			} else {
 				$app->log('Backup directory not ready.', LOGLEVEL_DEBUG);
 			}
@@ -227,6 +228,7 @@ class backup_plugin {
 						}
 					}
 				}
+				if( $server_config['backup_dir_is_mount'] == 'y' ) $app->system->umount_backup_dir($backup_dir);
 			} else {
 				$app->log('Backup directory not ready.', LOGLEVEL_DEBUG);
 			}