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ACCA Strategic Professional · Strategic Business Leader · IT systems security and control

Nordvik Retail takes a full backup every Sunday and a differential backup every other night. Data is lost on Thursday morning, before that day's backup. Which backups must be restored to recover the data to the latest point available?

Restore the Sunday full backup and the Wednesday night differential. A differential holds all changes since the last full backup, so earlier differentials are not needed, but the full backup is required as the base.

  1. ASunday full backup only
  2. BSunday full backup and every nightly differential from Monday to Wednesday
  3. CSunday full backup and the Wednesday night differentialCorrect
  4. DWednesday night differential only

Explanation

A differential backup contains all changes since the last full backup, so the Wednesday differential already includes Monday and Tuesday changes. Restoring the Sunday full plus Wednesday differential is sufficient. Restoring every differential is unnecessary, which is the incremental approach, and the differential alone lacks the base data.

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