Clarity regarding availability zones

Author: pvrk

articles/backup/backup-azure-arm-restore-vms.md

@@ -187,6 +187,14 @@ Currently, secondary region [RPO](azure-backup-glossary.md#rpo-recovery-point-ob
 
 In the restore process, you'll see the option **Availability Zone.** You'll see your default zone first. To choose a different zone, choose the number of the zone of your choice. If the pinned zone is unavailable, you won't be able to restore the data to another zone because the backed-up data isn't zonally replicated. The restore in availability zones is possible from recovery points in vault tier only.
 
+In summary, the **Availability Zone** will only appear when
+ - The source VM is zone pinned and is NOT encrypted
+ - The recovery point is present in vault tier only (Snapshots only or snapshot and vault tier are not supported)
+ - The recovery option is to either create a new VM or to restore disks (replace disks option replaces source data and hence the availability zone option is not applicable)
+ - Creating VM/disks in the same region when vault's storage redundancy is ZRS (Doesn't work when vault's storage redundancy is GRS even though the source VM is zone pinned)
+ - Creating VM/disks in the paired region when vault's storage redundancy is enabled for Cross-Region-Restore AND if the paired region supports zones
+
+
 ![Choose availability zone](./media/backup-azure-arm-restore-vms/cross-zonal-restore.png)
 
 ### Monitoring secondary region restore jobs
@@ -330,4 +338,4 @@ There are a few things to note after restoring a VM:
 ## Next steps
 
 - If you experience difficulties during the restore process, [review](backup-azure-vms-troubleshoot.md#restore) common issues and errors.
-- After the VM is restored, learn about [managing virtual machines](backup-azure-manage-vms.md)
+- After the VM is restored, learn about [managing virtual machines](backup-azure-manage-vms.md)