What is a backup and why is it important?

• A. A separate hard drive that automatically replaces the original when damaged.
• B. A copy of important data used to restore data after loss; it protects against hardware failure, deletion, or corruption.
• C. A cloud service that prevents every data loss by itself.
• D. A system that automatically deletes old files to free space.

Answer: (B)

A backup is a separate copy of your important data that you can restore from if something goes wrong. This is why it’s essential: if a hard drive fails, a file is accidentally deleted, or data becomes corrupted, you can recover to a previous working state using the backup. Backups support data recovery and business continuity, letting you minimize downtime and loss.

The other ideas don’t capture the full purpose of backups. A mirror or automatic replacement on a separate drive is a kind of redundancy, but backups aren’t limited to automatic drive swaps and must cover various loss scenarios. A cloud service alone cannot guarantee against all data loss without proper backup practices and safeguards. Automatic deletion of old files describes space management, not preserving data for recovery.