"Those four switches below it act as emergency backup throttles."

The mutual help system has to take into account things like holidays and emergency backup.

But until help arrives, emergency backup should include assistance for passengers and vehicles.

The emergency backup came on line, then started signaling its impending failure.

What if my current computer breaks down and I need emergency backup?

But 1 could use one more pair of hands, as an emergency backup.

Or that the controls were regarded as little more than an emergency backup?

The back sheath was really an emergency backup, not a main weapon.

The company decided to move other systems onto the emergency backup.

A few residents, widely scattered throughout the hospital, served as emergency backup.