Backpost:

Backpost is the post on a team’s own goal that is farthest from the ball, used as a defensive reference point in Rocket League. Players often rotate to the back post when falling back, because it helps cover the goal mouth and makes it easier to challenge shots or crosses from a safer angle.

It is a common part of defensive positioning and team rotations, especially on saves, clear attempts, and when recovering after an attack.

Related: Goal Line