The difference between Backup and Extra
When used as nouns, backup means a reserve or substitute, whereas extra means something additional, such as an item above and beyond the ordinary school curriculum, or added to the usual charge on a bill.
When used as adjectives, backup means standby, reserve or extra, whereas extra means beyond what is due, usual, expected, or necessary.
Extra is also adverb with the meaning: to an extraordinary degree.
check bellow for the other definitions of Backup and Extra
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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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Extra as an adjective:
Beyond what is due, usual, expected, or necessary; extraneous; additional; supernumerary.
Examples:
"extra work; extra pay"
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Extra as an adjective (dated):
Extraordinarily good; superior.
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Extra as an adjective (North America, slang):
Over-the-top; going beyond what is normal or expected, often in a dramatic manner.
Examples:
"You deleted your photos of her because she lost your Snapchat streak!? You're so extra!"
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Extra as an adverb (informal):
To an extraordinary degree.
Examples:
"That day he ran to school extra fast."
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Extra as a noun:
Something additional, such as an item above and beyond the ordinary school curriculum, or added to the usual charge on a bill.
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Extra as a noun:
An extra edition of a newspaper, which is printed outside of the normal printing cycle.
Examples:
"Extra, extra! Read all about it!"
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Extra as a noun (cricket):
A run scored without the ball having hit the striker's bat - a wide, bye, leg bye or no ball; in Australia referred to as a sundry.
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Extra as a noun (acting):
A supernumerary or walk-on in a film or play.
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Extra as a noun:
Something of an extra quality or grade.