On this page https://backports.debian.org/FAQ/
I suspect there is an error in the answer to the fourth FAQ. My understanding is that "stable-backports" currently means the same thing as "jessie-backports", and that "oldstable-backports" means "wheezy-backports". If I am wrong, I hope somebody will correct me. On the other hand, if my understanding is correct, the link labeled "wheezy-backports" in the answer to "Is there security support for packages from backports.debian.org?" which points to https://security-tracker.debian.org/tracker/status/release/stable-backports is misleading. Either the link should be labeled "jessie-backports", or it should point to https://security-tracker.debian.org/tracker/status/release/oldstable-backports