the following powershell can be used to find all VSS scheduled tasks and alter the minutes to a random value.
$TaskService = new-object -comobject "Schedule.Service"
$TaskService.Connect()
$Folder = $TaskService.GetFolder("\")
$Task = $folder.GetTasks(0) | where {$_.Name.StartsWith("ShadowCopyVolume")}
if($Task.GetType().BaseType.Name -eq "Array") {
exit 1
}
$SetMinute=Get-Random -Minimum 1 -Maximum 59
$TaskDef=$Task.Definition