Merge pull request #246088 from AdamZLi/patch-9

Update disks-prem-v2-limitations.md

Author: prmerger-automator[bot]

includes/disks-prem-v2-limitations.md

@@ -14,6 +14,7 @@
 - Currently, Premium SSD v2 disks can only be attached to zonal VMs.
 - Currently, encryption at host isn't supported for Premium SSD v2 disks. You can still attach Premium SSD v2 disks to VMs where you have enabled encryption at host for disk types.
 - Azure Disk Encryption (guest VM encryption via Bitlocker/DM-Crypt) isn't supported for VMs with Premium SSD v2 disks. We recommend you to use encryption at rest with platform-managed or customer-managed keys, which is supported for Premium SSD v2. 
-- Currently, Premium SSD v2 disks can't be attached to VMs in Availability Sets.
-- Azure Backup and Azure Site Recovery aren't supported for VMs with Premium SSD v2 disks.
+- Currently, Premium SSD v2 disks can't be attached to VMs in Availability Sets. 
+- Azure Site Recovery aren't supported for VMs with Premium SSD v2 disks.
+- Azure Backup is currently in [public preview](../articles/backup/backup-support-matrix-iaas.md#vm-storage-support) for VMs with Premium SSD v2 disks. 
 - The size of a Premium SSD v2 can't be expanded without either deallocating the VM or detaching the disk.