Why Backup and Recovery Matter
No matter how reliable Azure is, data can still be lost due to accidental deletion, corruption, ransomware, or disasters. A strong storage design always includes backup, recovery, and archival strategies.
As a Solution Architect, your job is to ensure data meets RTO (Recovery Time Objective) and RPO (Recovery Point Objective) requirements while balancing cost efficiency.
Core Backup and Recovery Services
1. Azure Backup
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Fully managed service for backup and recovery.
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Supports: VMs, SQL databases, Azure Files, and on-premises servers.
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Features:
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Application-consistent backups.
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Long-term retention (years).
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Geo-redundant storage options.
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Best for: Protecting workloads with minimal overhead.
2. Azure Site Recovery (ASR)
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Provides disaster recovery (DR) by replicating VMs and workloads to another Azure region or on-prem datacenter.
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Features:
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Near-zero downtime failover.
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Automated recovery plans.
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Supports both Azure and hybrid workloads.
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Best for: Critical workloads needing business continuity in case of regional outages.
3. Archival Storage
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Azure Blob Storage provides Cool and Archive tiers for long-term data storage.
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Archive tier is cheapest but requires rehydration (hours) before access.
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Used for compliance or historical data that is rarely accessed.
Design Considerations
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Match Retention with Compliance
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Financial institutions may need 7+ years of backups.
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Healthcare must meet HIPAA/GDPR data retention.
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Define RPO and RTO
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RPO: How much data loss is acceptable? (e.g., 15 min, 1 hr).
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RTO: How quickly must systems be restored? (e.g., 2 hrs, 24 hrs).
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Tiered Approach
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Hot tier for active workloads.
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Cool tier for infrequent access.
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Archive tier for compliance storage.
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Integration with Security
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Use encryption for backup data.
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Ensure MFA and RBAC protect backup vaults.
Example Enterprise Scenario
A healthcare company requires:
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Daily backups of SQL databases with 7-year retention.
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Disaster recovery for patient portal apps across regions.
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Cost-effective storage of old imaging records rarely accessed.
Correct design:
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Use Azure Backup for SQL with long-term retention.
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Use ASR to replicate patient portal VMs to a secondary region.
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Store imaging records in Archive Blob tier.
Confusion Buster
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Azure Backup vs ASR:
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Backup = recover data from point in time.
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ASR = replicate entire workloads for disaster recovery.
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Cool vs Archive tier:
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Cool = cheaper than Hot, immediate retrieval.
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Archive = cheapest, but slow rehydration.
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Backup Vault vs Recovery Services Vault:
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Recovery Services Vault = traditional model.
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Backup Vault = newer, optimized for scale and RBAC.
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Exam Tips
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“Which service replicates workloads across regions for DR?” → ASR.
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“Which service provides long-term backup retention?” → Azure Backup.
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“Which storage tier for compliance data rarely accessed?” → Archive tier.
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“Company requires failover with minimal downtime.” → ASR.
What to Expect in the Exam
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Direct Q: “Which Azure service provides disaster recovery replication?” → Site Recovery.
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Scenario Q: “Company must retain backups for 7 years.” → Azure Backup with long-term retention.
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Scenario Q: “Which blob tier for storing medical images rarely accessed?” → Archive.
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Trick Q: “Azure Backup and ASR are the same.” → False.