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Zorluk: OrtaBusiness Continuity and Disaster Recovery

An enterprise network administrator configures a backup schedule where a full backup is executed every Sunday at 01:00 AM, and differential backups are executed daily at 11:00 PM from Monday through Saturday. On Thursday at 03:00 PM, a primary storage array suffers an unrecoverable disk crash. Which of the following represents the minimum sequence of restoration jobs required to recover the system to its latest available backup state?

  1. Restore the Sunday full backup, followed by the Wednesday differential backup.Cevap
  2. B
    Restore the Sunday full backup, followed sequentially by the Monday, Tuesday, and Wednesday differential backups.
  3. C
    Restore the Sunday full backup, followed by the Thursday differential backup.
  4. D
    Restore only the Wednesday differential backup directly to the storage volume.

Cevap

Restore the Sunday full backup, followed by the Wednesday differential backup.
Differential backups accumulate all changes made since the last full baseline backup. Consequently, recovering a system configured with a full baseline and differential backups requires restoring the full backup first, followed strictly by the single most recent differential backup set (Wednesday at 11:00 PM).

Adım Adım Çözüm

1
Analyze the backup type and execution schedule relative to the failure time.
The system utilizes a Sunday full backup baseline and daily 11:00 PM differential backups. The failure occurred Thursday at 03:00 PM.
The Thursday differential backup job has not executed yet, making Wednesday's 11:00 PM backup the latest completed differential set.
2
Identify the mandatory baseline restoration file.
The Sunday full backup must be restored first.
Differential backup sets do not contain the baseline file system structure or unmodified data and depend entirely on the preceding full backup.
3
Determine the minimal differential backup restoration steps required.
Apply only the Wednesday differential backup.
Each differential backup cumulatively includes all changes since the last full backup, so intermediate differential backups (Monday and Tuesday) are superseded by the Wednesday backup.

Anahtar Kavram

Differential Backup Restoration Mechanics
Tahmini Süre:1m 30s
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Konular

Business Continuity and Disaster Recovery

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