Definition of Backop

BACK UP. His back is up, i.e. he is offended or angry; an
expression or idea taken from a cat; that animal, when
angry, always raising its back. An allusion also sometimes
used to jeer a crooked man; as, So, Sir, I see somebody
has offended you, for your back is up.

(Cricket) For the non striker to take a few steps down the pitch, in preparation to taking a run, just as the bowler bowls the ball.
(Cricket) For a fielder to position himself behind the wicket (relative to a team-mate who is throwing the ball at the wicket) so as to stop the ball, and prevent overthrows.

backup

A reserve or substitute.
If the goalkeeper is injured, we have a backup.
(computing) A copy of a file or record, stored separately from the original, that can be used to recover the original if it is destroyed or damaged.
After the power failure, we had to restore the database from backup.
An accumulation of material that halts the flow or movement of something.
The blockage caused a backup in the plumbing.
standby, reserve or extra
I am only a backup player.
(computing) That is intended as a backup.
Make a backup copy of that file.

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