computer backup

Từ điển WordNet v3.1 - WordNet Dictionary

noun

(computer science) a copy of a file or directory on a separate storage device
- he made a backup in case the original was accidentally damaged or erased
• Syn:
backup
• Derivationally related forms:
back up (for: backup)
• Topics:
computer science, computing
• Hypernyms:
duplicate, duplication