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Difficulty: HardBusiness Continuity and Disaster Recovery

A network operations team is establishing a disaster recovery restoration procedure for a core authentication server. The server undergoes a scheduled full backup every Sunday at 01:00. To balance storage utilization and recovery speed, the team configures daily differential backups Monday through Saturday at 23:00. On Friday at 14:00, a primary storage array failure causes complete data loss on the server. Which sequence of backup sets must the network administrator restore to bring the system to its most recent available state using the fewest restoration steps?

  1. Restore the Sunday full backup, followed only by the Thursday differential backup.Answer
  2. B
    Restore the Sunday full backup, followed sequentially by the Monday, Tuesday, Wednesday, and Thursday differential backups.
  3. C
    Restore only the Thursday differential backup directly, as it contains all accumulated system files.
  4. D
    Restore the Thursday differential backup first, followed by the Sunday full backup to overwrite base configuration files.

Answer

Restore the Sunday full backup, followed only by the Thursday differential backup.
Differential backups accumulate all changed data since the last full baseline backup without clearing the archive bit. Restoring the Sunday full backup restores the base system, and applying only the latest differential backup (Thursday at 23:00) brings the system up to date with the minimum number of steps.

Step-by-Step Solution

1
Identify the backup strategy type and archive behavior
Differential backups store all cumulative changes made since the last full backup baseline without clearing the archive attribute.
Understanding how differential backups function determines the required set of files for recovery.
2
Determine the baseline restoration point
The Sunday 01:00 full backup provides the fundamental file structure and data baseline.
All differential restores require the initial underlying full backup baseline to be restored first.
3
Select the minimal set of differential archives required for the latest state prior to failure
Because Thursday 23:00 is the last successful backup before the Friday 14:00 failure, the Thursday differential set contains all changes from Sunday 01:00 to Thursday 23:00.
Differential backups accumulate all changes since the full backup, making intermediate daily differential backups redundant.

Key Concept

Differential Backup Restoration Sequence
Estimated Time:2m 0s
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Topics

Business Continuity and Disaster Recovery

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