BlobBackupDatasourceParameters objectType is missing from BackupInstance policy parameters

[AliJP]

Resource Type

Microsoft.DataProtection/backupVaults/backupInstances

Api Version

2025-07-01

Issue Type

Type is unavailable

Other Notes

I tried to create a backup instance for our blob storage and then filter the blob containers using BlobBackupDatasourceParameters based on this document.
In the latest version of bicep (0.37.4), the only availabe values for policyInfo.policyParametersbackupDatasourceParametersList.objectType are AdlsBlobBackupDatasourceParameters and KubernetesClusterBackupDatasourceParameters and it misses the BlobBackupDatasourceParameters value to filter blob containers in the backup.

Bicep Repro

resource backupInstance 'Microsoft.DataProtection/backupVaults/backupInstances@2025-07-01' = {
name: backupInstanceName
parent: backupVault
properties: {
dataSourceInfo: {
resourceID: storageAccountId
objectType: 'Datasource'
resourceLocation: location
datasourceType: 'Microsoft.Storage/storageAccounts/blobServices'
}
objectType: 'BackupInstance'
policyInfo: {
policyId: backupPolicyId
policyParameters: {
backupDatasourceParametersList: [
{
containersList: blobContainersList
objectType: 'BlobBackupDatasourceParameters'
}
]
}
}
}
}

Confirm

• I have read the troubleshooting guide and looked for duplicates.