powershell - backup every 4 hours

I need to make backups of my system state on my windows 2016 server hyper-v domain controller. The only way for this to work is thru power shell. I am only able to run this for one time. How do I write this t run every 4 hours in PowerShell?

# Runs  from PS on DC1
Register-ScheduledJob -Name “System State Backup” -Trigger @{Frequency = “Daily”; At = “2:00”} -ScriptBlock {
	# Create new Backup Policy
	$Policy = New-WBPolicy

	# Add System State to the policy
	Add-WBSystemState -Policy $Policy

	# Set Backup Location
	$BackupLocation = New-WBBackupTarget -VolumePath "\\bugsbunny\svrA"

	# Add backup location to policy
	Add-WBBackupTarget -Policy $Policy -Target $BackupLocation

	# Start Backup Using Policy
	Start-WBBackup -Policy $Policy
}

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Martin_01Asked:
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RobertSystem AdminCommented:
If the scheduled job is not working  it could be that since your not passing credentials the scheduled job is not able to run.

Ref:
https://docs.microsoft.com/en-us/powershell/module/psscheduledjob/register-scheduledjob?view=powershell-5.1

You could just save the script as a ps1 and schedule it via task scheduler.
MaheshArchitectCommented:
if you are doing AD system state backup with windows server backup, you can simply use GUI to schedule backup every 4 HRS

If this is core server you can use command line option
wbadmin enable backup -addtarget:F: -schedule:00:00,04:00,08:00,12:00,16:00,20:00 -systemState -quiet 

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Jose Gabriel Ortega CastroEE Solution Guide/Topic Advisor and CEO Faru Bonon ITCommented:
Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
Just add -RunEvery (New-Timespan -hours 4) to your Register-ScheduledJob.
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