For many new users the usage of the backlink-link is not apparent. Besides it is often mistaken with the home link. It seems more like a "hidden feature" when it really is a quite important feature.
The minimum of usability should be adding a *title* explaining where the link points to ("Pages that link to this page" or similar).
IMHO it would be even better to take the link entirely away and place it somewhere else, where the user is used to "action links".
See here for a discussion: http://forum.dokuwiki.org/thread/1616