Hyper-V(2012R2) Backup with Checkpoints(Snapshot) and Export - What to consider ?

good evening

Today Irecognized that a VM Snapshot (excusea checkpoint) canbe exported  withWindows Server2012R2. 
The subsequentimportresulted in a functionalVMinsavedstate.  

Question:What concerns a backup to a deduplicated Drivewith the followingPowerShellcommands?

# Backup running VM's on a hyper-v 2012R2
# (p) by steini'14

$rootPath = "I:\VMBackup"

#create Backup Path of the Day
$path = new-item -ItemType Directory -Path "$rootPath\$(Get-Date -f yy_MM_dd_HH-mm)"

# Do Snapshot and export and "Merge!" Snapshot/Checkpoint for each vm on this host.
foreach ($vm in get-vm){
    write-host "Start: $($vm.Name)"
    $snap = $vm |checkpoint-vm -SnapshotName "BackupJob $(Get-Date -f yy_MM_dd_HH-mm)" -Passthru
    $snap | Export-VMSnapshot -Path $Path.FullName
    $snap | Remove-VMSnapshot
}
Start-DedupJob -Volume $path.Root -Type Optimization -Wait

#PrepareDisk:
#Add-WindowsFeature -name FS-Data-Deduplication
#Enable-DedupVolume I:
#Set-DedupVolume g: -MinimumFileAgeDays 0
#Start-DedupJob -Volume i: -Type Optimization -Wait