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Zorluk: ZorBusiness Continuity and Disaster Recovery

A senior infrastructure engineer is defining the emergency recovery protocol for an enterprise network orchestrator host. The host's backup policy mandates a full system backup executed every Sunday at 01:00, daily incremental backups created Monday through Friday at 22:00, and hourly configuration state exports taken at the top of every hour. An unrecoverable storage array crash corrupts the primary orchestrator host on Thursday at 14:15. Which of the following backup restoration sequences must be executed to restore the orchestrator to its most recent operational state prior to the failure while preserving data integrity?

  1. Restore the Sunday full backup, sequentially restore the Monday, Tuesday, and Wednesday incremental backups, and then apply all hourly state exports captured on Thursday up to 14:00.Cevap
  2. B
    Restore the Sunday full backup, restore only the Wednesday incremental backup, and then apply all hourly state exports captured on Thursday up to 14:00.
  3. C
    Restore the Sunday full backup and directly apply all hourly state exports captured on Thursday up to 14:00, bypassing daily incremental files.
  4. D
    Restore the Wednesday incremental backup first to establish the latest daily baseline, apply the Thursday hourly state exports up to 14:00, and finalize by restoring the Sunday full backup.

Cevap

The correct restoration sequence requires restoring the Sunday full backup, followed sequentially by the Monday, Tuesday, and Wednesday incremental backups, and finally applying all hourly state exports recorded on Thursday prior to the outage at 14:15.
An incremental backup set records only the data modified since the previous backup event (whether full or incremental). To achieve a complete point-in-time recovery, the administrator must first restore the baseline full backup (Sunday), followed by each daily incremental backup in chronological order (Monday, Tuesday, Wednesday), and finally apply point-in-time state exports (Thursday hourly exports up to 14:00).

Adım Adım Çözüm

1
Identify the backup strategy type and baseline.
The backup baseline is the Sunday 01:00 full system backup.
All recovery procedures using full and incremental media must start with the most recent full system backup.
2
Determine the required incremental backup media sequence.
Incremental backups capture changes relative to the preceding backup (full or incremental). Therefore, Monday, Tuesday, and Wednesday incrementals must be restored sequentially.
Unlike differential backups (which accumulate changes since the full backup), incremental backups only contain changes since the immediately preceding incremental backup.
3
Identify point-in-time state exports up to the failure time.
Apply all hourly configuration exports from Thursday (01:00 through 14:00).
The failure occurred at 14:15, so the 14:00 export is the last valid point-in-time state snapshot prior to the crash.

Anahtar Kavram

Incremental Backup Recovery Chain
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Konular

Business Continuity and Disaster Recovery

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