What is another word for backup?

Need synonyms for backup? Here's a list of words from our thesaurus that you can use instead.

Noun
A person or thing that takes the place of another
“She was added to the squad as a backup.”
Noun
Help or support
“As a police officer, he has access to certain assault weapons and handguns, as well as receiving a certain amount of backup from other police officers.”
Noun
Accumulation of material
“… there was the inevitable backup of travelers trying to pass through airport security.”
Noun
Copy of file or record
Adjective
Standby, reserve or extra
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