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Zorluk: Çok zorBusiness Continuity and Disaster Recovery

A regional bank experienced a storage area network (SAN) volume failure on Thursday at 13:30. The network operations team maintains the following backup schedule for the critical database volume:

- Full backup: Executed every Sunday at 01:00
- Differential backup: Executed daily Monday through Wednesday at 23:00
- Incremental backup: Executed every 4 hours daily (03:00, 07:00, 11:00, 15:00, 19:00, 23:00)

To achieve the minimum Recovery Time Objective (RTO) while recovering all data up to the latest available recovery point prior to the outage, which restoration sequence must the backup engineer execute?

  1. Restore Sunday's Full backup, restore Wednesday's Differential backup, and sequentially apply Thursday's 03:00, 07:00, and 11:00 Incremental backups.Cevap
  2. B
    Restore Sunday's Full backup, sequentially apply Monday's, Tuesday's, and Wednesday's Differential backups, and sequentially apply Thursday's 03:00, 07:00, and 11:00 Incremental backups.
  3. C
    Restore Sunday's Full backup and sequentially apply every Incremental backup taken from Monday 03:00 through Thursday 11:00, bypassing the Differential backups.
  4. D
    Restore Wednesday's Differential backup directly onto the array, followed by Thursday's 11:00 Incremental backup only.

Cevap

The optimal sequence is to restore Sunday's Full backup, apply Wednesday's Differential backup, and then sequentially apply Thursday's 03:00, 07:00, and 11:00 Incremental backups.
The correct strategy combines the full baseline backup with the single latest cumulative differential backup, followed by every incremental backup taken after that differential up to the target restore time. Sunday's full backup restores the foundation, Wednesday's differential incorporates all changes up to Wednesday night in a single operation, and the three Thursday incrementals recover all subsequent changes prior to the failure, minimizing the total number of restoration operations to optimize RTO.

Adım Adım Çözüm

1
Identify the latest full baseline image.
Sunday's 01:00 Full backup establishes the baseline dataset.
Differential and incremental backups rely on the underlying full backup block state.
2
Select the latest cumulative differential backup taken prior to the outage.
Wednesday's 23:00 Differential backup contains all data changes from Sunday 01:00 to Wednesday 23:00.
Using the latest differential supersedes all previous differentials (Monday and Tuesday), minimizing total restore steps.
3
Identify and sequentially apply all incremental backups created after the selected differential backup.
Apply Thursday 03:00, Thursday 07:00, and Thursday 11:00 Incremental backups in chronological order.
Incremental backups contain changes only since the immediate prior backup (or differential), bringing the volume to 11:00 Thursday (the last clean state before the 13:30 outage).

Anahtar Kavram

Disaster recovery backup restoration sequencing combining full, differential, and incremental backup sets to optimize RTO.
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Konular

Business Continuity and Disaster Recovery

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