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CV0-003 · Question #278

A VM was deleted by mistake today at 11:05 a.m. Below are the backups currently available for the VM: Crash-consistent restore is acceptable. Which of the following backups should be chosen?

The correct answer is A. Snapshot from today at 11:00. The 11:00 AM snapshot is only 5 minutes before the deletion event and represents the smallest RPO of all available backups, and because crash-consistent restores are explicitly acceptable it is the best choice.

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Question

A VM was deleted by mistake today at 11:05 a.m. Below are the backups currently available for the VM:

Crash-consistent restore is acceptable. Which of the following backups should be chosen?

Exhibit

CV0-003 question #278 exhibit

Options

  • ASnapshot from today at 11:00
  • BFull from three days ago at 00:00
  • CIncremental from today at 00:00
  • DSynthetic-full from yesterday at 12:00

How the community answered

(23 responses)
  • A
    78% (18)
  • B
    4% (1)
  • C
    4% (1)
  • D
    13% (3)

Why each option

The 11:00 AM snapshot is only 5 minutes before the deletion event and represents the smallest RPO of all available backups, and because crash-consistent restores are explicitly acceptable it is the best choice.

ASnapshot from today at 11:00Correct

The snapshot taken at 11:00 AM was captured just 5 minutes before the VM was accidentally deleted at 11:05 AM, minimizing data loss to the shortest possible recovery point. Because the question states crash-consistent restores are acceptable, the snapshot's crash-consistent nature is not a disqualifier. All other available backups are hours or days older, resulting in far greater data loss.

BFull from three days ago at 00:00

The full backup from three days ago is the oldest restore point available and results in the maximum data loss of approximately three days, making it the least preferred option when newer backups exist.

CIncremental from today at 00:00

The incremental backup from today at 00:00 is 11 hours older than the 11:00 AM snapshot and also requires a full backup chain to complete the restore, making it less optimal than option A.

DSynthetic-full from yesterday at 12:00

The synthetic-full from yesterday at 12:00 is approximately 23 hours older than the 11:00 AM snapshot, resulting in substantially greater data loss compared to option A.

Concept tested: Selecting optimal restore point to minimize RPO

Source: https://learn.microsoft.com/en-us/azure/backup/backup-architecture

Topics

#backup recovery#snapshot restore#VM restoration#RTO

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