by Andrew Normore.
To clarify, here's what you change to just make it work:
// set_time_limit(self::TIME_LIMIT_WITHOUT_PROGRESS); // This is a 2.6 bug,
set_time_limit(0); // Nasty hack to fix timeouts
File is found in C:\wamp\www\moodle\backup\core_backup_progress.class.php on line 204 (ish, depending on your version)