in computing, to make a security copy of (data, a file, etc)

to hold (something) back; to cause (something) to accumulate

The dam was backing up an immense quantity of water

in computing, to make a copy of data, a file, etc, esp for security reasons

said of traffic: to form an increasing queue behind a hazard or congestion

in cricket, said of the non-receiving batsman: to move forward down the wicket when the ball is bowled to be ready to make a run