What is data backup?

• A. A routine that encrypts data for security.
• B. A copy of data stored separately to recover quickly after data loss or corruption.
• C. A method to delete old data.
• D. A process to store copies of data only on the same device.

Answer: (B)

Data backup means making a copy of data so you can restore it quickly if something goes wrong. The key idea is to keep that copy separate from the original location so you aren’t tied to one device or system.

This option is the best because it describes both the purpose (recovery after loss or corruption) and the important detail that the copy is stored separately for protection.

Encrypting data is about security, not how you recover data. Deleting old data isn’t about having a recoverable copy. Storing copies only on the same device means a single failure could wipe both the original and the backup, which defeats the purpose of a backup.