a copy of data or files that can be used to restore the original in case of loss or damage, a person or thing that serves as a substitute

have someone's back, take a back seat, watch someone's back

backup dancer, backup generator, backup vocals

Formal and Informal Expressions of backup

In different contexts, you can replace 'backup' with suitable alternatives. In a more formal setting, 'substitute, replacement' is apt. In informal speech or writing, 'plan B, fallback' is a commonplace synonym.

backup: Explore its Definition & Usage

backup Definition

1a copy of data or files that can be used to restore the original in case of loss or damage
2a person or thing that serves as a substitute

Using backup: Examples

Take a moment to familiarize yourself with how "backup" can be used in various situations through the following examples!

Example
Make sure you have a backup of all your important files.
Example
The backup quarterback came in after the starter was injured.
Example
We need a backup plan in case the first one fails.
Example
The band's lead singer was sick, so the backup singer took over.

backup Synonyms and Antonyms

Synonyms for backup

Antonyms for backup

Idioms Using backup

have someone's back
to be supportive of someone, especially in difficult situations
Example
I know I can count on my best friend to have my back no matter what.
take a back seat
to assume a less important or prominent role
Example
I'm happy to take a back seat and let someone else lead the project this time.
watch someone's back
to protect or look out for someone
Example
I'll watch your back while you make the deal with the other party.

Phrases with backup

backup dancer
a dancer who performs behind the main performer, providing support and complementing the main performance
Example
The pop star's backup dancers were dressed in colorful outfits and performed synchronized dance moves.
backup generator
an electrical generator that automatically starts up when the main power supply fails
Example
The hospital has a backup generator to ensure that critical equipment remains operational during power outages.
backup vocals
vocal harmonies sung by a supporting vocalist or group of vocalists to complement the lead vocalist
Example
The song's chorus features backup vocals that add depth and richness to the melody.

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Summary: backup in Brief

The term 'backup' [ˈbækʌp] refers to a copy of data or files that can be used to restore the original in case of loss or damage. It also denotes a person or thing that serves as a substitute. Examples include 'Make sure you have a backup of all your important files.' and 'The backup quarterback came in after the starter was injured.' Phrases like 'have someone's back' and 'take a back seat' are idiomatic expressions that use 'backup' to convey support or a less prominent role.