Update backup-azure-vms-troubleshoot.md

Add troubleshooting entry for Linux drives mounted with name instead of UUID.

Author: sooryar12

articles/backup/backup-azure-vms-troubleshoot.md

@@ -371,6 +371,9 @@ If after restore, you notice the disks are offline then:
 * Verify if the machine where the script is executed meets the OS requirements. [Learn more](./backup-azure-restore-files-from-vm.md#step-3-os-requirements-to-successfully-run-the-script).
 * Ensure you are not restoring to the same source, [Learn more](./backup-azure-restore-files-from-vm.md#step-2-ensure-the-machine-meets-the-requirements-before-executing-the-script).
 
+### Folder is missing when a Linux VM is recovered as a new VM
+This issue can occur if disks are mounted to a directory using the device name (e.g., /dev/sdc1) instead of UUID. When the VM reboots or when it is recovered as a new VM, the device names are assigned in a random order. To ensure that the right drive is mounted to your directory, always mount drives using UUID obtained from the `blkid` utility. [Learn more](../virtual-machines/linux/attach-disk-portal.yml).
+
 ### UserErrorInstantRpNotFound - Restore failed because the Snapshot of the VM was not found
 
 Error code: UserErrorInstantRpNotFound <br>
@@ -560,4 +563,4 @@ DHCP must be enabled inside the guest for IaaS VM backup to work. If you need a
 Get more information on how to set up a static IP through PowerShell:
 
 * [How to add a static internal IP to an existing VM](/powershell/module/az.network/set-aznetworkinterfaceipconfig#description)
-* [Change the allocation method for a private IP address assigned to a network interface](../virtual-network/ip-services/virtual-networks-static-private-ip-arm-ps.md)
+* [Change the allocation method for a private IP address assigned to a network interface](../virtual-network/ip-services/virtual-networks-static-private-ip-arm-ps.md)