This script registers a scheduled job to run the specified script on a schedule. It can register the job to run as local system or as the user who called this script.

Register-ScheduledTask2.ps1

<#
        .SYNOPSIS
        Registers a scheduled job to run the specified script on a schedule.

        .DESCRIPTION
        This script registers a scheduled job to run the specified script on a schedule. It can register the
        job to run as local system or as the user who called this script.

        .PARAMETER At
        The time at which the job should be triggered. The format is 24 hours like 21:00.

        .PARAMETER ScriptPath
        The full path to the script.

        .PARAMETER ScriptBlock
        The script block to be executed.

        .PARAMETER ArgumentList
        If the script to be called by the scheduled job has parameters, you can pass them by means of the
        ArgumentList parameter.

        .PARAMETER JobName
        This defines the name of the scheduled job in the task scheduler.

        .PARAMETER RunAsLocalSystem
        The task will run as the local machine account.

        .PARAMETER Force
        When set and if there is a scheduled job with the same name already existing, it will be overwritten.

        .PARAMETER ExecutionHourTimeLimit
        Can be used to set the execution time limit of the scheduled task. The value is in hours.

        .PARAMETER RunNow
        When set, the scheduled job will be started immediately.

        .PARAMETER ReceiveData
        When set, the output of the scheduled job will be received.

        .EXAMPLE
        & '.\Register-ScheduledTask2.ps1' -At 21:00 -ScriptPath 'D:\AD Backup Transfer\Copy-Backup.ps1' -ArgumentList \\dscfile01\Backup -RunAsLocalSystem -Force

        This example registers a scheduled job to run the script 'C:\AD Backup Transfer\Start-Backup.ps1' to copy
        Windows Backup data to the UNC path '\\dscfile01\Backup' at 21:00. It will run as the local system account.
#>

param (
    [Parameter(Mandatory)]
    [ValidatePattern('^(?:[01]?\d|2[0-3])(?::[0-5]\d){1,2}$')]
    [string]$At,
    
    [Parameter(Mandatory, ParameterSetName = 'Script')]
    [ValidateScript({ Test-Path -Path $_ })]
    [string]$ScriptPath,

    [Parameter(Mandatory, ParameterSetName = 'ScriptBlock')]
    [scriptblock]$ScriptBlock,
    
    [Parameter()]
    [object[]]$ArgumentList,
    
    [Parameter()]
    [string]$JobName = (New-Guid),
    
    [Parameter()]
    [switch]$RunAsLocalSystem,

    [Parameter()]
    [int]$ExecutionHourTimeLimit,
    
    [Parameter()]
    [switch]$RunNow,
    
    [Parameter()]
    [switch]$ReceiveData,
    
    [Parameter()]
    [switch]$Force
)
    
$trigger = New-JobTrigger -Daily -At $At
$accountId = 'NT AUTHORITY\SYSTEM'
$principal = New-ScheduledTaskPrincipal -UserId $accountId -LogonType ServiceAccount -RunLevel Highest
$psJobsPathInScheduler = '\Microsoft\Windows\PowerShell\ScheduledJobs'
    
$job = Get-ScheduledJob -Name $JobName -ErrorAction SilentlyContinue
if ($job -and $Force) {
    Write-Verbose "Removing the old job with the name '$JobName' in path '$psJobsPathInScheduler'."
    $job | Unregister-ScheduledJob -Confirm:$false
}
elseif ($job) {
    Write-Error "A job with the name '$JobName' in path '$psJobsPathInScheduler' does already exsit."
    return
}
    
$param = @{
    Name     = $JobName
    Trigger  = $trigger
}
if ($ArgumentList) {
    $param.Add('ArgumentList', $argumentList)
}
if ($ScriptPath)
{
    $param.Add('ScriptPath', $scriptPath)
}
if ($ScriptBlock)
{
    $param.Add('ScriptBlock', $ScriptBlock)
}

$job = Register-ScheduledJob @param
    
if ($RunAsLocalSystem) {
    Set-ScheduledTask -TaskPath $psJobsPathInScheduler -TaskName $JobName -Principal $principal | Out-Null
}

if ($ExecutionHourTimeLimit) {
    $task = Get-ScheduledTask -TaskPath "$psJobsPathInScheduler\" -TaskName $JobName
    $task.Settings.ExecutionTimeLimit = "PT$($ExecutionHourTimeLimit)H"
    $task | Set-ScheduledTask | Out-Null
}

if ($RunNow)
{
    $job = $job | Set-ScheduledJob -RunNow -PassThru
    Start-Sleep -Seconds 1
    if ($ReceiveData)
    {
        Get-Job -Name $job.Name | Receive-Job -Wait -AutoRemoveJob
    }
}