I'd like to store my wp-config.php file in the directory above my WordPress install, as recommended in Hardening WordPress in the Codex. For a site installed in the root, this means wp-config is outside the web-root (or public_html) folder.
I don't see a way to have BackWPup back up this file. I see that I can back up any directory by path, using the Include Folders to Backup field under File Backup, but not a way to select a single file. Is this possible?