Data Redundancy (LRS, ZRS, GRS, RA-GRS)

Azure Storage automatically replicates your data to protect against hardware failures, network outages, and regional disasters. The redundancy option you choose determines how many copies of your data are kept and where they are stored. This lesson covers all six redundancy options, their durability guarantees, failover behaviour, and how to choose the right option for your workload.

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Why Redundancy Matters

Data loss can be catastrophic. Azure Storage always maintains multiple copies of your data, but the level of protection varies:

• Hardware failure — a disk or server fails in a data centre
• Data centre outage — an entire facility loses power or network
• Regional disaster — a natural disaster or major outage affects an entire Azure region

Your redundancy choice determines how well your data survives each scenario.

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Redundancy Options Overview

Azure Storage offers six redundancy options in two categories:

Primary Region Redundancy