Ubercart: come settare correttamente il campo "Card number encryption key filepath"

Salve, di nuovo, a tutti. La domanda è sinteticamente in oggetto. Ho visto il manuale sul sito ubercart.org ma voglio essere sicuro di non fare danni.

Uso host Aruba. Il manuale Ubercart.com dice di creare una cartella keys alla root del mio spazio web (http://www.ubercart.org/docs/user/2731/credit_card_settings#security)

Quote:

First, you must configure the encryption settings for card data during checkout. To do this, you'll need to fill in the filepath textfield. Here you should specify a folder that is outside of your document root (i.e. not in your www or public_html directory) where the module can create a key file to encrypt credit card data. You will need to grant permissions on the folder that allow Drupal to write to it, but you can change this once the encryption file has been created. Relative paths will be resolved relative to the Drupal installation directory, so if you have a directory structure like the following:
mysite
mysite/www <-- Drupal installed here.
mysite/keys

You would be able to specify ../keys and Drupal will make sure the credit card encryption key is created in the proper directory. For security reasons, you should not use your site's files directory except in testing.

Io l'ho creata al livello più basso che mi è concesso, ovvero dove ci sono i file install.php, index ecc.....ho fatto bene???