Kleine kosmetische Korrektur, dann passt's:
While ( $true ) {
$DATA = (Get-ItemProperty -Path HKLM:\SOFTWARE\Synology\ActiveBackupforBusinessCustom\LastBackupStatus)
$LastBackupTime = [datetime]::ParseExact($DATA.LastBackupEndTime,'yyyyMMdd HH:mm:ss',$null)
$LastBackupStatus =...