dbutil - how to target a different group?

[eluser]da_n[/eluser]
Thanks but I tried this before, I just get the following error:

Code:

A PHP Error was encountered

Severity: Notice

Message: Undefined property: CI_DB_mysql_driver::$load

Filename: controllers/backup.php

Line Number: 13

Fatal error: Call to a member function dbutil() on a non-object in /var/www/vhosts/[removed]/httpdocs/system/application/controllers/backup.php on line 13

By the way the code does work if I use the default group only.

EDIT: Sorry there was a little problem with the controller code but it does work, it just needs instances of

Code:

$filename_$date

to be replaced with

Code:

$filename".'_'."$date

. The above error is still being displayed however.