The meaning of BACKUP is one that serves as a substitute or support. How to use backup in a sentence.

Before we leave work each day, we make a backup of all the records we have entered into the computer that day. The department's backup disks are all stored in a different building.

BACKUP definition: a person or thing that supports or reinforces another. See examples of backup used in a sentence.

Backup In information technology, a backup, or data backup is a copy of computer data taken and stored elsewhere so that it may be used to restore the original after a data loss event. The …

one who supports or reinforces another: I’m his backup; (computers) a copy or duplicate version of a file, program, or computer system: I made a backup of the file.

Backup consists of extra equipment, resources, or people that you can get help or support from if necessary. There is no emergency back-up immediately available. Alternative …

(computing) a copy of a file, etc. that can be used if the original is lost or damaged. Always make a backup of your work. Definition of backup noun in Oxford Advanced Learner's Dictionary. …

Backup is what someone gives when they help or support you. A brand new doctor might need some backup in the emergency room for the first few weeks. Use the noun backup when you …

Jan 20, 2026 · (computing) A copy of a file or record, stored separately from the original, that can be used to recover the original if it is damaged or destroyed. After the power failure, we …

From Longman Business Dictionary back‧up /ˈbækʌp/ noun [countable] a copy of information held on a computer that is put onto a DISK so that the information is not lost if there is a …