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Difficulty: HardBusiness Continuity and Disaster Recovery

An enterprise network operations center manages a critical financial application server. The server's disaster recovery policy dictates a full system image backup every Sunday at 01:00 AM, along with cumulative differential backups executed each night from Monday through Saturday at 11:00 PM. On Friday at 10:00 AM, a storage controller failure permanently corrupts the primary volume. What is the minimum and correct sequence of backup restoration operations required to bring the system back to its most recent consistent operational state?

  1. Restore the Sunday full backup image, followed by the Thursday differential backup image.Answer
  2. B
    Restore the Sunday full backup image, followed sequentially by the Monday, Tuesday, Wednesday, and Thursday differential backup images.
  3. C
    Restore only the Thursday differential backup image directly to the target storage array.
  4. D
    Restore the Thursday differential backup image first to recover recent delta changes, then apply the Sunday full backup image to overwrite missing system files.

Answer

Restore the Sunday full backup image, followed by the Thursday differential backup image.
Differential backups capture all modified data since the last full backup. Restoring the initial Sunday full backup establishes the baseline dataset, and applying the Thursday differential backup updates all files to their state as of Thursday night (11:00 PM) without needing intermediate daily differential sets.

Step-by-Step Solution

1
Identify the backup schedule type and baseline file set.
The baseline image is the full backup created on Sunday at 01:00 AM.
Every recovery process requires initializing the target storage with the last known full backup baseline.
2
Analyze the properties of the daily backup strategy.
Daily backups are differential, meaning each daily set contains all changed data since the Sunday full backup.
Differential backups accumulate modifications over time relative to the last full backup, unlike incremental backups which capture only changes made since the previous backup of any type.
3
Determine the optimal restoration sequence.
The system requires restoring the Sunday full backup first, followed by the Thursday 11:00 PM differential backup.
The Thursday differential backup already includes all changes accumulated from Monday, Tuesday, and Wednesday, making intermediate differential files redundant.

Key Concept

Differential Backup Restoration Sequence
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Topics

Business Continuity and Disaster Recovery

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