In this comprehensive guide, I will walk you through exactly how to backup storage accounts in Azure. I will explain the native tools, the managed Azure Backup service, and the strategies I personally recommend to ensure your data remains bulletproof against ransomware, accidental deletions, and corruption.
How to Backup Storage Account in Azure
The Critical Distinction: Redundancy vs. Backup
Before we dive into the “how-to,” I need to clarify the “why.” When you create a Storage Account in Azure, you select a replication strategy—typically Locally-Redundant Storage (LRS), Zone-Redundant Storage (ZRS), or Geo-Redundant Storage (GRS).
Here is the hard truth: Replication protects you from hardware failures; Backup protects you from logic failures and human error.
If a disgruntled employee performs a hard delete on a container, or if a ransomware script encrypts your files, that deletion or corruption is instantly replicated to all redundant copies. If you have GRS (Geo-Redundant Storage) enabled between East US and West US, the corruption is faithfully copied to the West US region.
To truly protect your storage account, you need a strategy that allows for point-in-time recovery.
Layer 1: Native Data Protection Features
In my experience, the first line of defense is often the most effective for quick recovery. Azure Storage offers several “Data Protection” features that operate at the storage account level. These are not “backups” in the traditional sense of a secondary copy, but they are essential for operational recovery.
Soft Delete for Blobs and Containers
I always recommend enabling Soft Delete immediately upon creating a storage account. Soft delete acts like a “Recycle Bin” for your storage. When you turn this on, any blob or container that is deleted is not actually removed; it is marked as soft-deleted and held for a retention period you specify (between 1 and 365 days).
During this window, I can restore the data to its state prior to deletion. For most US-based compliance standards, I typically recommend a retention period of at least 14 to 30 days.
Blob Versioning
Versioning is distinct from Soft Delete. When I enable versioning, Azure automatically maintains the history of a blob. Every time a blob is overwritten, a “version” is created.
Table: Comparison of Native Protection Features
| Feature | Primary Use Case | Protection Type |
| Soft Delete | Accidental Deletion | Recover deleted items for $X$ days. |
| Versioning | Overwrites/Corruption | Restore a specific previous state of a file. |
| Change Feed | Auditing | Logs all changes (creation, modification, deletion). |
| Point-in-Time Restore | Mass Restoration | Roll back the entire container to a specific timestamp. |
Layer 2: Azure Backup for Blobs (Operational Backup)
While native features are great, managing them at scale can be tedious. This is where Azure Backup comes into play. Microsoft has introduced a managed solution known as Operational Backup for Blobs.
Instead of sending your data to a separate “vault” (which transfers data and incurs high bandwidth costs), Operational Backup is a local backup solution. It orchestrates the native capabilities I mentioned above (Soft Delete, Versioning, and Point-in-Time Restore) but manages them through a centralized Backup Policy.
How I Configure Operational Backup
When I set this up for clients, I don’t go to the Storage Account blade first. I go to the Backup Center.
- Backup Vault Creation: I create a Backup Vault (not to be confused with a Recovery Services Vault).
- Policy Definition: I define a backup policy. For example, I might set a policy that enforces retention of data for 30 days.
- Assignment: I assign this policy to the specific Storage Accounts.
The beauty of this approach is that the data doesn’t leave the storage account, meaning the backups are incredibly fast and cost-effective.
If your organization uses Azure Files (the SMB protocol service), the backup methodology is slightly different compared to Blobs. For Azure Files, Azure Backup uses the snapshot capability.
The Snapshot Mechanism
When I configure backup for Azure File Shares, the service takes scheduled snapshots of the file share. These snapshots are incremental. If I have a 1TB file share but only change 5GB of data today, the snapshot will only consume storage equivalent to that 5GB change.
Configuring the Recovery Services Vault
Unlike Blobs, Azure Files are backed up using a Recovery Services Vault. Here is the high-level workflow I follow:
- Navigate to the Recovery Services Vault in the Azure Portal.
- Select + Backup.
- Choose Azure as the workload and Azure File Share as the resource type.
- Select the Storage Account and the specific File Share to protect.
- Define the Backup Policy. Check out the screenshots below for the complete steps.