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Difficulty: HardDesign Azure Backup Solutions

You are designing a business continuity and backup strategy for a set of Azure Virtual Machines that host a critical ERP system.

The system has the following requirements:
- Any VM recovery for outages occurring within the last 10 days must complete in under 15 minutes.
- Backups must be retained for 3 years to comply with regulatory audits.
- The backups must remain available for restore in a secondary paired region even if the primary region experiences a prolonged outage.
- Storage cost must be minimized while meeting all recovery objectives.

Which backup configuration should you recommend?

  1. A Recovery Services vault configured with Geo-redundant storage (GRS) and Cross Region Restore (CRR) enabled, utilizing an Enhanced backup policy with the instant restore retention set to 10 days and vault retention set to 36 months.Answer
  2. B
    A Recovery Services vault configured with Geo-redundant storage (GRS) and Cross Region Restore (CRR) enabled, utilizing a Standard backup policy with the instant restore retention set to 10 days and vault retention set to 36 months.
  3. C
    A Recovery Services vault configured with Locally-redundant storage (LRS) and Cross Region Restore (CRR) enabled, utilizing an Enhanced backup policy with the instant restore retention set to 10 days and vault retention set to 36 months.
  4. D
    A Recovery Services vault configured with Geo-redundant storage (GRS) and Cross Region Restore (CRR) enabled, utilizing a Standard backup policy with the instant restore retention set to 5 days and vault retention set to 36 months.

Answer

A Recovery Services vault configured with Geo-redundant storage (GRS) and Cross Region Restore (CRR) enabled, utilizing an Enhanced backup policy with the instant restore retention set to 10 days and vault retention set to 36 months.
To satisfy the RTO of 15 minutes for recoveries up to 10 days old, the solution must utilize snapshot-based instant restore. Because the Standard backup policy only supports instant restore retention of up to 5 days, an Enhanced backup policy is required to support the 10-day retention. Furthermore, to enable recovery in a secondary paired region, the vault must be configured with Geo-redundant storage (GRS) and Cross Region Restore (CRR) enabled.

Step-by-Step Solution

1
Analyze the recovery time objective (RTO) and time window.
Recovery must occur within 15 minutes for disruptions up to 10 days old. This requires restoring from local snapshots (instant restore) rather than from the vault tier.
Vault-tier restores involve transferring data back to the disk and take significantly longer, exceeding the 15-minute RTO, whereas snapshot restores are near-instantaneous.
2
Evaluate the instant restore policy constraints in Azure Backup.
Standard backup policies restrict instant restore retention to a maximum of 5 days. Enhanced backup policies allow configuring instant restore retention between 1 and 30 days.
Since a 10-day instant restore window is required, the Enhanced backup policy must be chosen.
3
Determine the required storage redundancy for disaster recovery.
Geo-redundant storage (GRS) with Cross Region Restore (CRR) enabled is necessary to allow restores in a secondary paired region.
Locally-redundant storage (LRS) only maintains copies within the primary region and cannot support CRR.

Key Concept

Selecting and configuring the appropriate Azure VM backup policy type (Standard vs. Enhanced) and storage redundancy model based on strict RTO, retention, and disaster recovery requirements.
Estimated Time:2m 0s
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Topics

Design Azure Backup Solutions

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