backroom means: An area to store excess product, which can be used as a storage space or to replenish the sales floor when necessary. (in Cooking Dictionary)

What else does backroom mean?

The rear room is the bedroom. (in Merlin Dictionary)

A meeting location used by an invisible controlling group. (in Merlin Dictionary)

A backroom is a place that’s related to or takes place in. (in Merlin Dictionary)

This is a result of the use inconspicuous maneuvering and control. (in Merlin Dictionary)