more updates

Author: AbhishekMallick01

articles/backup/selective-disk-backup-restore.md

@@ -24,9 +24,11 @@ This is supported both for Enhanced Policy (preview) as well as Standard Policy.
 This solution is useful particularly in the following scenarios:
 
 1. If you have critical data to be backed up in only one disk, or a subset of the disks and don’t want to back up the rest of the disks attached to a VM to minimize the backup storage costs.
-2. If you have other backup solutions for part of your VM or data. For example, if you back up your databases or data using a different workload backup solution and you want to use Azure VM level backup for the rest of the data or disks to build an efficient and  robust system using the best capabilities available.
+2. If you've other backup solutions for part of your VM or data. For example, if you back up your databases or data using a different workload backup solution and you want to use Azure VM level backup for the rest of the data or disks to build an efficient and  robust system using the best capabilities available.
 
-Using PowerShell or Azure CLI, you can configure selective disk backup of the Azure VM. Using a script, you can include or exclude data disks using their LUN numbers. Currently, the ability to configure selective disks backup through the Azure portal is limited to the **Backup OS Disk only** option. So you can configure backup of your Azure VM with OS disk, and exclude all the data disks attached to it.
+3. If you're using [Enhanced policy](backup-azure-vms-enhanced-policy.md), you can use this solution to exclude unsupported disks (Ultra Disks, Shared Disks) and configure a VM for backup. 
+
+Using PowerShell, Azure CLI, or Azure portal, you can configure selective disk backup of the Azure VM. Using a script, you can include or exclude data disks using their LUN numbers. The ability to configure selective disks backup through the Azure portal is limited to the **Backup OS Disk only** for the Standard policy, but can be configured for all data disks. So, you can configure backup of your Azure VM with OS disk, and exclude all the data disks attached to it.
 
 >[!NOTE]
 > The OS disk is by default added to the VM backup and can't be excluded.
@@ -35,6 +37,9 @@ Using PowerShell or Azure CLI, you can configure selective disk backup of the Az
 
 Ensure you're using Az CLI version 2.0.80 or higher. You can get the CLI version with this command:
 
+>[!Note]
+>These CLI steps apply to selective disk backup for VMs using both policies - enhanced and standard.
+
 ```azurecli
 az --version
 ```
@@ -294,17 +299,24 @@ Here you can view the backed-up disks during restore, when you select the recove
 
 ![View backed-up disks during restore](./media/selective-disk-backup-restore/during-restore.png)
 
-Configuring the selective disks backup experience for a VM through the Azure portal is limited to  the **Backup OS Disk only** option. To use selective disks backup on already a backed-up VM or for advanced inclusion or exclusion of specific data disks of a VM, use PowerShell or Azure CLI.
+- If you're using Standard policy to back up the VM, configuring the selective disks backup experience for a VM through the Azure portal is limited to  the **Backup OS Disk only** option. To use selective disks backup on already a backed-up VM or for advanced inclusion or exclusion of specific data disks of a VM, use PowerShell or Azure CLI.
+
+- If you're using Enhanced policy to back up the VM, you can select the data disks you want to back up, and optionally choose to include disks added to the VM in future for back up.
 
 >[!NOTE]
 >If data spans across disks, make sure all the dependent disks are included in the backup. If you don’t backup all the dependent disks in a volume, during restore the volume comprising of some non-backed up disks won't be created.
 
-### Backup OS disk only in the Azure portal
+### Backup OS disk only in the Azure portal (Standard policy)
 
 When you enable backup using Azure portal, you can choose the **Backup OS Disk only** option. So you can configure backup of your Azure VM with OS disk, and exclude all data disks attached to it.
 
 ![Configure backup for the OS disk only](./media/selective-disk-backup-restore/configure-backup-operating-system-disk.png)
 
+## Configure Selective Disk Backup in the Azure Portal (Enhanced Policy)
+
+When you enable the backup operation using the Azure portal, you can choose the data disks that you want to include in the backup (the OS disk is always included). You can also choose to include disks that are added in the future for backup automatically by enabling the “Include future disks” option.
+
+
 ## Using Azure REST API
 
 You can configure Azure VM Backup with a few select disks or you can modify an existing VM's protection to include/exclude few disks as documented [here](backup-azure-arm-userestapi-backupazurevms.md#excluding-disks-in-azure-vm-backup).
@@ -321,21 +333,30 @@ Selective disk restore is an added functionality you get when you enable the sel
 
 ## Limitations
 
-Selective disks backup functionality isn't supported for classic virtual machines and encrypted virtual machines. So Azure VMs that are encrypted with Azure Disk Encryption (ADE) using BitLocker for encryption of Windows VM, and the dm-crypt feature for Linux VMs are unsupported.
+Selective disks backup functionality for Standard policy isn't supported for classic virtual machines and encrypted virtual machines. So Azure VMs that are encrypted with Azure Disk Encryption (ADE) using BitLocker for encryption of Windows VM, and the dm-crypt feature for Linux VMs are unsupported. However, VMs with Azure Disk Encryption enabled can use selective disk backup with Enhanced policy.
 
 The restore options to **Create new VM** and **Replace existing** aren't supported for the VM for which selective disks backup functionality is enabled.
 
-Currently, Azure VM backup doesn't support VMs with ultra-disks or shared disks attached to them. Selective disk backup can't be used to in such cases, which exclude the disk and backup the VM.
+Currently, Azure VM backup doesn't support VMs with ultra-disks or shared disks attached to them. Selective disk backup for Standard policy can't be used to in such cases, which exclude the disk and backup the VM. You can use selective disk backup with Enhanced policy to exclude these disks and configure backup.
 
 If you use disk exclusion or selective disks while backing up Azure VM, _[stop protection and retain backup data](backup-azure-manage-vms.md#stop-protection-and-retain-backup-data)_. When resuming backup for this resource, you need to set up disk exclusion settings again.
 
 ## Billing
 
 Azure virtual machine backup follows the existing pricing model, explained in detail [here](https://azure.microsoft.com/pricing/details/backup/).
 
-**Protected Instance (PI) cost** is calculated for the OS disk only if you choose to back up using the **OS Disk only** option.  If you configure backup and select at least one data disk, the PI cost will be calculated for all the disks attached to the VM. **Backup storage cost** is calculated based on only the included disks and so you get to save on the storage cost. **Snapshot cost** is always calculated for all the disks in the VM (both the included and excluded disks).
+- If you're using Standard policy, **Protected Instance (PI) cost** is calculated for the OS disk only if you choose to back up using the **OS Disk only** option.  If you configure backup and select at least one data disk, the PI cost will be calculated for all the disks attached to the VM. **Backup storage cost** is calculated based on only the included disks and so you get to save on the storage cost. **Snapshot cost** is always calculated for all the disks in the VM (both the included and excluded disks).
+
+- If you're using Enhanced policy, **Protected Instance (PI)** cost, snapshot cost, and vault tier storage cost are all calculated based on the disks that you've included for backup.
+
+  **Known limitations**
 
-If you have chosen the Cross Region Restore (CRR) feature, then the [CRR pricing](https://azure.microsoft.com/pricing/details/backup/) applies on the backup storage cost after excluding the disk.
+  | OS type | Limitation |
+  | --- | --- |
+  | Windows | - **Spanned volumes**:  For spanned volumes (volumes spread across more than one physical disk), ensure that all disks are included in the backup. If not, Azure Backup might not be able to reliably restore the data and exclude it in billing. <br><br> - **Storage pool**: If you're using disks carved out of a storage pool and if a *LUN number* included for backup is common across virtual disks and data disks, the size of the virtual disk is also included in the backup size in addition to the data disks. |
+  |	Linux | - **Logical volumes**: For logical volumes spread across more than one disk, ensure that all disks are included in the backup. If not, Azure Backup might not be able to reliably restore the data and exclude it in billing. <br><br> - **Distro support**: Azure Backup uses *lsscsi* and *lsblk* to determine the disks being excluded for backup. If your distro (Debian 8.11, 10.13, and so on) doesn't support *lsscsi*, install it using `sudo apt install lsscsi` to ensure Selective disk backup works. |
+
+- If you've chosen the Cross Region Restore (CRR) feature, then the [CRR pricing](https://azure.microsoft.com/pricing/details/backup/) applies on the backup storage cost after excluding the disk.
 
 ## Frequently asked questions
 
@@ -348,11 +369,15 @@ PI cost is calculated based on actual (used) size of the VM.
 
 ### I have configured only OS disk backup, why is the snapshot happening for all the disks?
 
-Selective disk backup features let you save on backup vault storage cost by hardening the included disks that are part of the backup. However, the snapshot is taken for all the disks that are attached to the VM. So the snapshot cost is always calculated for all the disks in the VM (both the included and excluded disks). For more information, see [billing](#billing).
+If you're using standard policy, the Selective disk backup features let you save on backup vault storage cost by hardening the included disks that are part of the backup. However, the snapshot is taken for all the disks that are attached to the VM. So the snapshot cost is always calculated for all the disks in the VM (both the included and excluded disks). For more information, see [billing](#billing).
+
+If you're using Enhanced policy, the snapshot is taken only for the OS disk and the data disks that you've included.
 
 ### I can't configure backup for the Azure virtual machine by excluding ultra disk or shared disks attached to the VM
 
-Selective disk backup feature is a capability provided on top of the Azure virtual machine backup solution. Currently, Azure VM backup doesn't support VMs with ultra-disk or shared disk attached to them.
+If you're using Standard policy, Azure VM backup doesn't support VMs with ultra-disk or shared disk attached to them and it is not possible to exclude them with selective disk backup and then configure backup.
+
+If you're using Enhanced policy, you can exclude the unsupported disks from the backup via selective disk backup (in the Azure portal, CLI, PowerShell, and so on), and configure backup for the VM.
 
 ## Next steps