The "backup," "back-up," or "back it up" policy has become a staple of our site. In addition, we've seen a lot of questions concerning it on our meta.
That being said, there's no easy way to see discussion about this policy, as we have no tag for it and the policy tag isn't on all of them.
I suggest that we go through old meta questions and add the new back-up tag to questions concerning the policy to make these questions easier to find.