Snapshot a VM Scale Set instance and create a managed disk from it

create_managed_disk_from_vmss_snapshot.ps1

$resourceGroupName = "myResourceGroup"
$scalesetName = "myVMScaleSet"
$vmInstanceId = 0
$location = "eastus2"
 
 $snapshotName = "vmss_snapshot"

 # create the snapshot 

$vmss = Get-AzVmssVM -ResourceGroupName $resourceGroupName -VMScaleSetName $scalesetName -InstanceId $vmInstanceId     
$snapshotConfig = New-AzSnapshotConfig -Location $location -AccountType Standard_LRS -OsType Windows -CreateOption Copy -SourceUri $vmss1.StorageProfile.OsDisk.ManagedDisk.id
New-AzSnapshot -ResourceGroupName $resourceGroupName -SnapshotName $snapshotName -Snapshot $snapshotConfig

# create a managed disk from the snapshot

$snapshot = Get-AzSnapshot -ResourceGroupName $resourceGroupName -SnapshotName $snapshotName  
$diskConfig = New-AzDiskConfig -AccountType Premium_LRS -Location $location -CreateOption Copy -SourceResourceId $snapshot.Id
$osDisk = New-AzDisk -Disk $diskConfig -ResourceGroupName $resourceGroupName -DiskName ($snapshotName + '_Disk')