Implementing retention policies for Azure File Share backups

Question

Pulumi · Accepted Answer

To implement retention policies for Azure File Share backups, we will use the `azure.backup.PolicyFileShare` resource from the Pulumi Azure provider. This resource manages File Share backups through Azure File Share Backup Policies. With this resource, you can define the specifics of your backup scheme, including the frequency of backups, their retention period, and the exact times at which they should occur.

Here's a step-by-step guide on what we will be doing in the Pulumi program below:

1. **Setting up the environment**: We'll start by importing the necessary Pulumi and Azure packages.
2. **Creating the Backup Policy**: We'll create a new backup policy that dictates how often backups are made and how long they are kept. We define a daily retention policy that keeps a specified number of daily backups.
3. **Assigning Policy to a File Share**: While the snippet does not directly show it, typically you would assign this policy to an existing Azure File Share.
4. **Exporting the Output**: At the end, we'll export the backup policy's ID so we can easily reference it later.

Here's how you would do it in Pulumi using TypeScript:

```typescript
import * as azure from "@pulumi/azure";

// Define the Azure File Share backup policy with retention policies
const fileShareBackupPolicy = new azure.backup.PolicyFileShare("myBackupPolicy", {
    resourceGroupName: "myResourceGroup", // Replace with your resource group name
    recoveryVaultName: "myRecoveryServicesVault", // Replace with your Recovery Services Vault name
    // Define the backup frequency and times
    backup: {
        frequency: "Daily", // Could be "Daily", "Weekly", "Monthly", etc.
        time: "23:00" // The time of day (in 24-hour format) when the backup should occur
    },
    // Define the retention policy for daily backups
    retentionDaily: {
        count: 10, // The number of daily backups to keep
    },
    // Add further retention policies for weekly, monthly, or yearly as needed
    // ...
    timezone: "UTC", // Define the timezone that the backup times are in
});

// Export the backup policy ID
export const backupPolicyId = fileShareBackupPolicy.id;
```

In this code, you'll need to replace `"myResourceGroup"` and `"myRecoveryServicesVault"` with the names of your own Azure Resource Group and Recovery Services Vault. The retention policy is configured to keep 10 daily backups. You can adjust this number and add more retention policies for weekly, monthly, or yearly backups as needed.

You would apply this backup policy to an Azure File Share. The File Share would then be backed up daily, according to this policy.

After running this Pulumi program, you can check the Azure portal to verify that the backup policy has been applied to your File Share. You can also use the `backupPolicyId` exported at the end of the program to reference this backup policy in other parts of your infrastructure as code, if needed.