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Common errors in English: Usage of backup / back up

 backup / back up - 


To “back up” is an activity; “back up your computer regularly”; “back up the truck to the garden plot and unload the compost.”


A “backup” is a thing: “keep your backup copies in a safe place.” Other examples: a traffic backup, sewage backup, backup plan, backup forces.

Older writers often hyphenated this latter form (“back-up”), but this is now rare.

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