- **Premium storage** with **BlockBlobStorage** is supported. Standard storage is supported. However, for audit to write to a storage account behind a virtual network or firewall, you must have a **general-purpose v2 storage account**. If you have a general-purpose v1 or Blob Storage account, [upgrade to a general-purpose v2 storage account](/azure/storage/common/storage-account-upgrade). For specific instructions see, [Write audit to a storage account behind VNet and firewall](audit-write-storage-account-behind-vnet-firewall.md). For more information, see [Types of storage accounts](/azure/storage/common/storage-account-overview#types-of-storage-accounts).
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