The difference between Backup and Stand-in
When used as nouns, backup means a reserve or substitute, whereas stand-in means a person of similar size and shape to an actor who "stands in" for that actor during the lengthy process of setting up a shot, but who, unlike a double, does not appear in the film.
Backup is also adjective with the meaning: standby, reserve or extra.
check bellow for the other definitions of Backup and Stand-in
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Backup as a noun:
A reserve or substitute.
Examples:
"If the goalkeeper is injured, we have a backup."
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Backup as a noun (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.
Examples:
"After the power failure, we had to restore the database from backup."
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Backup as a noun:
An accumulation of material caused by a (partial) obstruction or (complete) blockage of the flow or movement of the material, or an accumulation of material that causes an overflow due to the flow being greater than the maximum possible flow.
Examples:
"The accident caused a mile-long backup on the highway."
"The blockage caused a backup in the plumbing."
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Backup as a noun (law enforcement):
reinforcements
Examples:
"He's got a gun! You'd better send for backup."
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Backup as an adjective:
Standby, reserve or extra.
Examples:
"I am only a backup player."
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Backup as an adjective (computing):
That is intended as a backup.
Examples:
"Make a backup copy of that file."
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Backup as a verb:
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Stand-in as a noun:
A person of similar size and shape to an actor who "stands in" for that actor during the lengthy process of setting up a shot, but who, unlike a double, does not appear in the film.
Examples:
"They used a stand-in to set up the lighting so that the actor did not have to be there during the lengthy process."
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Stand-in as a noun:
A substitute.