Quick organizer script for keeping my camera uploads off of my low storage volume devices

DropboxCameraOrganize.ps1

$DaysBack = 14
$ArchiveYears = 2
[switch]$Timestamp = $true
[switch]$WhatIf = $false
$Types=(".png",".jpg",".gif",".mp4")

If($env:COMPUTERNAME -eq "ZEUS"){
    $FolderToOrganize = 'D:\Chris\Dropbox\Camera Uploads'
    $ArchiveLocation = 'D:\Chris\Dropbox\Archive\Photos'
}ElseIf($env:COMPUTERNAME -eq "NCC1701"){
    $FolderToOrganize = 'C:\Users\Christopher\Dropbox\Camera Uploads'
    $ArchiveLocation = 'C:\Users\Christopher\Dropbox\Archive\Photos'
}Else{
    $ErrorActionPreference = "Stop"
    Write-Error "we're boned. go look at the script."
    #That's code for you're running it on the wrong system and too lazy to deal with multiple paths.
}



If( $FolderToOrganize ) {
    $TopLevel = Get-Item ( $FolderToOrganize )
}Else{
    $TopLevel = Get-Item ( Get-Location )
}
$DateCutoff = (Get-Date).AddDays($DaysBack * -1)
$ArchiveCutoff = (Get-Date 1/1).AddYears(($ArchiveYears-1) * -1)

If( $Timestamp ){
    $FilesetToArchive = Get-ChildItem -Recurse -Path $FolderToOrganize | Where {$_.LastWriteTime -le "$ArchiveCutoff" -and $_.Extension -in $Types.Split(",") -and $_.Directory -notmatch "Shares"}
    $FilesetToOrganize = Get-ChildItem -Path $FolderToOrganize | Where {$_.LastWriteTime -le "$DateCutoff" -and $_.Extension -in $Types.Split(",") -and $_.Directory -notmatch "Shares"}
}Else {
    #Fuckoff
}

$FilesetToOrganize | ForEach-Object {
    $FileYear = ($_.LastWriteTime).Year
    $FileMonth = ($_.LastWriteTime).Month
    If(  !(Test-Path (Join-Path $FileYear $FileMonth))  ){
        New-Item -Name (Join-Path $FileYear $FileMonth) -ItemType Directory
    }
    $DestDir = (Join-Path $FileYear $FileMonth)
    Write-Output "Moving $_ to $DestDir"
    Move-Item $_ $DestDir
}

If($env:COMPUTERNAME -eq "ZEUS"){
    $FilesetToArchive | ForEach-Object {
        $FileYear = ($_.LastWriteTime).Year
        $FileMonth = ($_.LastWriteTime).Month
        If(  !(Test-Path (Join-Path $ArchiveLocation (Join-Path $FileYear $FileMonth)))  ){
            New-Item -Path $ArchiveLocation -Name (Join-Path $FileYear $FileMonth) -ItemType Directory
        }
        $DestDir = (Join-Path $ArchiveLocation (Join-Path $FileYear $FileMonth))
        Write-Output "Archiving $_ to $DestDir"
        Write-Output ("From path: "+$_.Directory)
        Move-Item $_.FullName $DestDir
    }
}