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Difficulty: MediumBusiness Continuity and Disaster Recovery

A network administrator is configuring the backup schedule for an enterprise monitoring server. Storage space at the off-site repository is limited, but the primary requirement is to minimize the Recovery Time Objective (RTO) during a total disaster recovery event. The full backup is performed every Sunday evening. Which daily backup strategy should the administrator implement to achieve the shortest recovery time while meeting storage constraints?

  1. Daily differential backups, because full restoration requires only the Sunday full backup and the most recent differential backup.Answer
  2. B
    Daily incremental backups, because full restoration requires only the Sunday full backup and the single most recent incremental backup.
  3. C
    Daily incremental backups, because applying fewer media sets during recovery reduces total disk input/output operations.
  4. D
    Daily synthetic full backups, because creating full backup images daily eliminates the need for any baseline full backup restoration.

Answer

Daily differential backups should be implemented because restoring a system backed up with differential backups requires only the initial full baseline backup and the single most recent differential backup, thereby optimizing the Recovery Time Objective (RTO).
Differential backups save all changes made since the last full baseline backup. When restoring a system, the administrator only needs to restore the full baseline backup and the latest differential backup set. This two-step restoration process minimizes system downtime and lowers the Recovery Time Objective (RTO).

Step-by-Step Solution

1
Analyze the business continuity requirement.
The key constraint is minimizing Recovery Time Objective (RTO) during system restoration under limited off-site storage availability.
RTO measures the target time required to restore network operations after a failure.
2
Compare differential versus incremental backup mechanics during recovery.
Incremental backups save space during daily backup jobs but require restoring the baseline full backup plus every sequential daily incremental file. Differential backups grow larger over the week but require restoring only two recovery sets: the baseline full backup and the latest differential backup.
Restoring fewer backup files reduces total downtime and operational recovery complexity.
3
Select the optimal backup strategy.
Daily differential backups balance reasonable daily storage usage with the fastest restoration workflow.
This strategy directly satisfies the objective of minimizing RTO while using storage efficiently compared to daily full backups.

Key Concept

Differential vs Incremental Backup Restoration Trade-offs
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Topics

Business Continuity and Disaster Recovery

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