Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “backup”

backup

noun [C/U]  /ˈbækˌʌp/ us  

backup noun [C/U] (SUPPORT)

support or help, or someone or something that provides support or help: a backup generator They didn’t realize when they hired him that he had a backup band. We want to have the factual backup to make our case.

backup noun [C/U] (EXTRA COPY)

an extra copy of information on a computer that is stored separately: Did you make a backup of these files?
(Definition of backup from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of backup?
Add Cambridge dictionaries to your browser to your website

Definitions of “backup” in other dictionaries

Word of the Day

knack

a skill or an ability to do something easily and well

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More