Backup restore problem


I´m using asterisk now, wich have freepbx, the version of the backup restore module I have is

I´m trying to use this module and it doesn´t work, I make the backup, but when i try to restore the backup is not available, the backup wasn´t created.

I have tried this:
chmod 755 /var/www/html/admin/modules/backup/bin/ampbackup.php

and then making the backup, but the folder:
is empty,

any suggests?

thanks in advance