back up & back off

The car backed up slowly out of the narrow driveway.

Back up a little — I can't see the screen from here.

The crowd backed up when the police moved forward.

He backed the truck up to the loading dock.

Everybody backe up, there's nothing to see here; give us some space.

Back off — this has nothing to do with you.

She told him to back off or she'd call the manager.

The dog growled until the stranger backed off.

He finally backed off when he realized he was wrong.

Hey, back off! Stop bullying Johnny.