backup

(also back-up)

/ˈbækʌp/ noun [C or U]

Definition

› a person, plan, piece of equipment, etc. that you can use to replace another if necessary: I use my other email account as a backup. The company is exploring alternative sources to provide backup for materials when the suppliers cannot deliver. Remember that your colleagues are your backup system when things go wrong.

› IT an extra copy of the information on a computer, that is stored separately: Keep a backup of your data in case a drive fails.

(Definition of backup noun from the Cambridge Business English Dictionary © Cambridge University Press)