Revise storage and resiliency information for backups

[rohan-sahini]

Updated storage and resiliency details for Managed Disk incremental snapshots, including ZRS support and conditions for new Backup Instances.

[prmerger-automator]

@rohan-sahini : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit c887c12:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/backup/azure-elastic-san-backup-overview.md	✅Succeeded

For more details, please refer to the build report.

[rohan-sahini]

#sign-off

[prmerger-automator]

Invalid command: '#sign-off'. Only the assigned author of one or more file in this PR can sign off. @AbhishekMallick-MS

[AbhishekMallick-MS]

As per the info from PG, the updates should go live on Nov 10, 2025. Will push it in the review queue on Monday.

[Copilot]

Pull Request Overview

This PR updates the backup documentation for Azure Elastic SAN to reflect enhanced storage redundancy options. The key change is adding support for Zone-Redundant Storage (ZRS) alongside the existing Locally Redundant Storage (LRS) for Managed Disk incremental snapshots.

Key Changes:

• Updated storage resiliency options to include both ZRS and LRS support
• Added detailed note explaining ZRS application conditions for new and existing Backup Instances

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[v-dirichards]

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team