Meaning of “back sth up” in the English Dictionary

"back sth up" in Business English

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back sth up

phrasal verb with back uk /bæk/ us verb [ T ]

IT to make an extra copy of a computer file, etc.:

Don't forget to back up your files at least once a week.
Research data and account information were backed up daily.

(Definition of “back sth up” from the Cambridge Business English Dictionary © Cambridge University Press)