Listing 1: BackupGPO.ps1
filter Do-GPOBackup
{
[begin callout A]
  $GPM = New-Object -comobject GPMgmt.GPM
[end callout A]
[begin callout B]
  $const = $GPM.GetConstants()
[end callout B]
[begin callout C]
  $GPMDomain = $GPM.GetDomain($_.Domain, "", $Const.UseAnyDC)
[end callout C]
[begin callout D]
  $GPO = $GPMDomain.GetGPO($_.GPOGUID)
[end callout D]
[begin callout E]
  $GPMResult = $GPO.Backup("C:\\backup", $_.Description)
[end callout E]

  Write-host "Backed up GPO $($_.GPOName)"
}