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Difficulty: MediumBusiness Continuity and Disaster Recovery

An organization executes a full system backup every Sunday at midnight. From Monday through Saturday, differential backups are executed daily at midnight. On Wednesday afternoon, a core router's storage drive fails, requiring a bare-metal recovery. Which of the following restoration sequences must the network administrator execute to restore the router configuration to its latest backed-up state?

  1. Restore the Sunday full backup, then restore the Tuesday differential backup.Answer
  2. B
    Restore the Sunday full backup, followed sequentially by the Monday differential backup and the Tuesday differential backup.
  3. C
    Restore the Sunday full backup, followed sequentially by the Monday, Tuesday, and Wednesday incremental backups.
  4. D
    Restore only the Tuesday differential backup.

Answer

Restore the Sunday full backup, then restore the Tuesday differential backup.
Differential backups store all data that has changed since the last full backup was taken. To recover a system backed up using a full-plus-differential scheme, an administrator must first restore the latest full backup (Sunday) and then apply the single most recent differential backup (Tuesday). This complete two-step procedure yields the latest data state prior to Wednesday's failure.

Step-by-Step Solution

1
Identify the baseline backup required for recovery.
The Sunday full backup provides the complete baseline environment.
All differential and incremental restore procedures require starting from the last full backup.
2
Determine the backup type used during weekdays.
The backup policy specifies daily differential backups.
Differential backups record all changes made since the last full backup and accumulate modifications daily without clearing the archive bit.
3
Select the latest differential backup prior to the outage.
The Tuesday differential backup contains all accumulated changes from Monday and Tuesday.
Applying the latest differential backup after the full backup fully restores the system state up to Tuesday midnight with exactly two restore operations.

Key Concept

Differential Backup Restoration Procedure
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Topics

Business Continuity and Disaster Recovery

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