Specifically, the rules of the IC forums. The rules for the Horde, Alliance, and Cross-faction forums state in their rules: "For stories taking place in the past, please post to the Backstories forum," yet the Backstories forum rules are, "This forum is used to post one-author stories taking place in the past. For stories following characters in current events or ongoing RP, please post to the Alliance, Horde, or Cross-Faction forums instead." Where then, would multi-author, ongoing RP threads set in the past, go?
I'm not sure there's a wrong answer this question, but the rules of all forums say that such threads should go in a different forum.