Fatal error: Maximum execution time of 120 seconds exceeded in C:\moodle\lib\filestorage\zip_archive.php on line 218

I am trying to spend some time cleaning up the backups and going through those that fail on automated backup.  This one course is getting about 95% through the backup and failing with

Fatal error: Maximum execution time of 120 seconds exceeded in C:\moodle\lib\filestorage\zip_archive.php on line 218

Now my PHP file has a maximum run time of 300 seconds, so its not that.  When I go to the files as detailed in the error it says nothing to do with execution time. 

        $res = $this->za->close();

Any ideas?

Server

Front - Windows 2008 R2, IIS, PHP 5.5.11

Back - Windows 2008 R2, MySQL 5.6.19