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If your disaster recovery copies were in the same region as the originals, you had redundancy but not geographic disaster recovery. A regional outage can take the original data and its same-region copies offline together. Those copies can still protect against smaller failures, such as a failed disk or a single datacenter problem, but they do not protect against losing the whole region.
The examples below use Microsoft Azure terminology, because Microsoft’s documentation describes these boundaries clearly. Other cloud providers use different names and defaults, so treat the Azure details as a model for the questions to ask, then confirm the equivalent settings on your own platform before you change production backups.
Why copies in one region fail together
Disaster recovery depends on where a copy sits relative to the thing it protects against. Three failure boundaries matter:
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- Local hardware or datacenter: a failed disk, server, rack, or building system inside one facility.
- Availability zone: a separately powered and networked facility within one region.
- Whole region: a broad outage affecting every facility in that geography.
A copy in the same region can help with the first boundary and, depending on the redundancy type, the second. It shares exposure to the third. That is the mistake behind most “our copies were in the same region” discoveries: the backup existed, and it was built to survive a smaller event than the one that happened.
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What Azure’s redundancy labels actually cover
Azure uses short codes that sound alike but protect against different things. The table summarizes how Microsoft’s Azure Backup security guidance and Azure Storage redundancy documentation describe them.
| Option | Where copies live | Protects against | Does not protect against |
|---|---|---|---|
| LRS (locally redundant storage) | Three copies within a single datacenter in the primary region (as described for Azure Backup data) | Hardware failures inside one datacenter | Loss of that datacenter, or a regional outage |
| ZRS (zone-redundant storage) | Copies spread across availability zones in the same region | Loss of one availability zone | A whole-region outage |
| GRS (geo-redundant storage) | Primary-region copies plus replication to a secondary region | A regional outage, provided you can read from or fail over to the secondary copy | Data written after the last replicated change, and any restore gap caused by the failover process itself |
| GZRS (geo-zone-redundant storage) | Zone redundancy in the primary region plus replication to a secondary region | Zone loss and regional outage, subject to the same secondary-access conditions as GRS | Data written after the last replicated change |
These are different resilience boundaries, not interchangeable labels. A workload on LRS in one datacenter and a workload on ZRS in the same region have different exposure, even though both are “redundant.”
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Microsoft describes GRS as designed for at least 16 nines (99.99999999999999%) of object durability over a given year. That is a design durability figure for stored objects. It is not an availability commitment, a recovery-time guarantee, or evidence that your application will survive a regional event. The Azure Storage documentation does not state a publication year for that figure, so check the current page before quoting it.
Replication is asynchronous, so the secondary copy can lag
Azure Storage states that GRS and GZRS copy data to the secondary region asynchronously. The practical consequence is that the secondary copy can be behind the primary at any moment. If a regional event happens shortly after a change, that change may not exist in the secondary copy.
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Do not assume zero data loss from geo-replication. Ask instead: how far behind can the secondary copy be, and does that gap fit inside the recovery point objective (RPO) the business has agreed to?
A replicated copy is not automatically a restore path
Replicated data and the ability to use it are separate questions. Microsoft’s Azure Storage documentation says data in the secondary region is not available for read or write access unless a failover happens, unless a read-access geo-redundancy option is configured. Failover is a procedure with its own steps, people, and time.
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Restore support also varies by service. For Azure virtual machine backups, Cross Region Restore is documented as a way to restore to a paired region. Check that the specific workload and configuration support it before you rely on it. Microsoft’s disaster recovery guidance for Azure Storage, last updated 2025-11-03, describes regional failover behavior and methods for copying some data to a storage account in another region; read that page for the exact steps that apply to your account type.
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Residency and sovereignty requirements decide which secondary regions are allowed. Microsoft’s reliability and disaster recovery guidance frames the choice as a two-branch decision:
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- If cross-region replication and recovery are permitted: choose a secondary region inside your compliance boundary. A compliant secondary region is often possible even when your primary region is not the one you would pick for recovery.
- If cross-region movement is prohibited: rely on availability zones and in-region redundancy, plus backup and restore that you have tested within the permitted regions. Set your recovery objectives to reflect that a regional event will take longer to recover from.
Verify which regions are allowed before you pick a secondary location. Do not assume that the nearest or cheapest region is permitted.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to check whether your copies share the same exposure
- Inventory every protected workload. List each system, its data type, and every backup or replica destination. Include storage accounts, backup vaults, and any scripts or exports that copy data elsewhere.
- Record the region and redundancy type for each destination. Note whether the copy is LRS, ZRS, GRS, GZRS, or a different mechanism, and which secondary region, if any, it uses.
- Mark copies that share the primary region. Any workload whose only copies are in the primary region has the same-region exposure described in the title.
- Confirm the secondary copy is usable. For geo-replicated storage, check whether read access to the secondary is configured or whether recovery requires a failover. For VM backups, confirm Cross Region Restore is supported for that workload.
- Compare against recovery objectives. Check the recovery time objective (RTO) and RPO for each workload against what the secondary path can actually deliver, including the replication lag.
- Check the provider’s support matrix. Support for cross-region features differs by service and configuration. Use the matrix published for your platform, not a general summary.
Restore tests you should run
Microsoft advises routinely testing restores within the regions your rules permit. A copy you have never restored is an assumption, not a recovery plan.
- Write the scenario. For example: “The primary region is unavailable. Restore the customer database to the permitted secondary path and bring up the application.”
- Run the restore on a non-production target. Use the same method your recovery plan names: failover, Cross Region Restore, or a restore from an in-region backup where cross-region movement is prohibited.
- Time each step. Record how long it takes to locate the recovery point, complete the restore, reconfigure dependencies, and confirm the application works.
- Compare results with the objectives. If the restored data is older than the RPO, or the restore takes longer than the RTO, the plan needs changing.
- Document and repeat. Write down who ran the test, what failed, and what changed. Repeat the test after significant changes to the workload, its regions, or its backup settings.
Options when the copies share a region
- Add a permitted secondary-region copy. This is the direct fix when compliance allows it. Choose the redundancy type that matches the workload’s RTO and RPO.
- Use a geo-redundant option for storage that supports it. Read-access options matter if you need the secondary copy available without a full failover.
- Accept in-region resilience with documented limits. Where cross-region movement is prohibited, keep zone-level protection and tested restores, and write down the longer recovery expected during a regional event so stakeholders are not surprised.
Cost is a real trade-off. Microsoft’s Azure Backup overview notes that GRS costs more than LRS. Compare that difference with the business impact of a regional outage for each workload, rather than deciding on storage price alone. Current pricing is set by the provider and changes over time, so check the pricing page for your region and plan.
Checking your own platform
The labels, failover mechanics, and restore options above are Azure examples. Other providers may offer equivalent zone, regional, and cross-region features under different names, with different defaults and different restore behavior. Confirm each setting against your provider’s current documentation and support matrix before changing production backups, and test any change in a non-production environment first.
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