Calling db:backup from Controller in IIS

[sethphillips]

This worked great in my osx development environment but not when deployed on an iis web server. It does not throw errors but the files are not created. It works correctly from a command line.
how do i test to see where it wrote files, if any?

Laravel 4.2

Artisan::call('db:backup',['filename'=>'app/storage/dumps/sqlbackup.sql']); Artisan::call('db:backup');