Update system/database/drivers/interbase/interbase_utility.php
diff --git a/system/database/drivers/interbase/interbase_utility.php b/system/database/drivers/interbase/interbase_utility.php
index 1b92af9..1642118 100644
--- a/system/database/drivers/interbase/interbase_utility.php
+++ b/system/database/drivers/interbase/interbase_utility.php
@@ -42,7 +42,7 @@
* @param string $filename
* @return mixed
*/
- protected function backup($filename)
+ protected function _backup($filename)
{
if ($service = ibase_service_attach($this->db->hostname, $this->db->username, $this->db->password))
{