Update Initialize-AzDataProtectionBackupInstance.md (#27140)

Author: NoriZC

src/DataProtection/DataProtection.Autorest/examples/Initialize-AzDataProtectionBackupInstance.md

@@ -52,4 +52,23 @@ Name BackupInstanceName
 ```
 
 The first command gets the backup vault. The second command get the AzureDatabaseForPGFlexServer policy.
-The third command datasource ARM Id. The fourth command initializes the backup instance. Similarly use datasourcetype AzureDatabaseForMySQL to initialize backup instance for AzureDatabaseForMySQL.
+The third command datasource ARM Id. The fourth command initializes the backup instance. Similarly use datasourcetype AzureDatabaseForMySQL to initialize backup instance for AzureDatabaseForMySQL.
+
+### Example 4: Initialize Backup instance object for Azure Blob Storage
+```powershell
+$storageAccountId = "/subscriptions/{subscriptionId}/resourcegroups/{resourceGroupName}/providers/Microsoft.Storage/storageAccounts/{storageAccountName}"
+$vault = Get-AzDataProtectionBackupVault -ResourceGroupName $resourceGroupName -VaultName $vaultName 
+$blobPolicy = Get-AzDataProtectionBackupPolicy -ResourceGroupName $resourceGroupName -VaultName $vault.Name -Name $policyName
+$backupConfig = New-AzDataProtectionBackupConfigurationClientObject -DatasourceType AzureBlob -IncludeAllContainer -StorageAccountResourceGroupName $resourceGroupName -StorageAccountName $storageAccountName
+$backupInstance = Initialize-AzDataProtectionBackupInstance -DatasourceType AzureBlob -DatasourceLocation $vault.Location -PolicyId $blobPolicy.Id -DatasourceId $storageAccountId -BackupConfiguration $backupConfig
+$backupInstance
+```
+
+```output
+Name BackupInstanceName
+---- ------------------
+     blobbackuptest-blobbackuptest-ed68435e-069t-4b4a-9d84-d0c194800fc2
+```
+
+The first command specifies the Blob storage account id. The second command gets the backup vault. The third command gets a Blob policy within the vault.
+The fourth command initializes the backup configuration. The fifth command initializes the backup instance.ype AzureDatabaseForMySQL to initialize backup instance for AzureDatabaseForMySQL.