Design for Azure Blob Backup and Recovery

This article demonstrates how to implement robust backup and recovery for Azure Blob Storage using soft delete, versioning, and Point-In-Time Restore (PITR). These techniques ensure that your data is protected against accidental deletions, overwrites, and corruption.

Key Features of Azure Blob Storage

Azure Blob Storage provides two primary data protection features:

• Soft Delete:

  • Protects blobs, containers, snapshots, and versions from accidental deletions.
  • Retains deleted items for a configurable period (1 to 365 days), allowing for easy restoration to their original location.
  • Supports both container-level and individual blob recovery.

• Blob Versioning:

  • Automatically creates a new version every time a blob is modified.
  • Allows you to access and restore any previous version, providing a safety net against unwanted changes.

Configuring Backup and Recovery via the Azure Portal

Step 1: Set Up Soft Delete and Versioning

1. Log in to the Azure portal and navigate to your storage account.
2. In the Overview pane, inspect the settings for soft delete, container soft delete, versioning, change feed, and other features.

At this stage, you can:

• Configure blob soft delete by setting the appropriate retention period.
• Enable container soft delete to recover an entire container and its contents.
• Activate blob versioning to maintain a history of changes made to blobs.

After you configure the settings, click Save to update the changes.

Step 2: Restore Deleted Containers and Blobs

Restoring a Deleted Container

If you accidentally delete a container:

1. Enable the Show deleted containers toggle in the Azure portal.
2. Locate the deleted container.
3. Click the three-dot menu (⋮) and select Undelete.
4. Click Save to restore the container along with its contents.

Restoring an Individual Blob

For individual blobs:

1. Enable the Show deleted blobs option.
2. Select the deleted blob.
3. Click Undelete.
   If the blob has multiple versions, all available versions will be displayed. Choose the version you wish to restore.

Step 3: Implement Point-In-Time Restore (PITR)

Point-In-Time Restore (PITR) provides an additional layer of protection by allowing you to revert your blob storage to a specific moment in time. Consider the following scenario:

• Three days ago (T minus three days), Container A contained three blobs, and Container B had two blobs.
• Two days ago (T minus two days), some blobs were deleted, leaving Container A with only one blob.
• With PITR enabled, you can restore all blobs to their state from three days ago.

To enable PITR:

1. Navigate to the Data Protection settings for your storage account.
2. Set the maximum restore point duration (for example, up to 10 days).
3. Ensure that the PITR retention period is equal to or less than the soft delete retention period, as PITR relies on the soft delete feature.
4. Click Save to apply this configuration.

Summary

Azure Blob Storage offers two key backup and recovery options:

By combining these methods, you can secure your data effectively and ensure rapid recovery in the event of unintended data loss or corruption.

Next, we will discuss the backup and recovery options available for Azure Files.