FileSystemWatcher_copy_on_change.ps1

#copied from https://gallery.technet.microsoft.com/scriptcenter/Powershell-FileSystemWatche-dfd7084b

$folder = 'C:\Users\IEUser\Desktop\testfolder'
$filter = '*.*'
$savefolder = 'C:\temp\'

$fsw = New-Object IO.FileSystemWatcher $folder, $filter -Property @{IncludeSubdirectories = $true;NotifyFilter = [IO.NotifyFilters]'FileName, LastWrite'} 
 
Register-ObjectEvent $fsw Changed -SourceIdentifier FileChanged -Action { 
    $filepath = $Event.SourceEventArgs.FullPath 
    $filename = ($Event.SourceEventArgs.Name).Split('\')[-1]
    $timeStamp = Get-Date -UFormat %s
    $savepath = -join ($savefolder, $timeStamp, '_', $filename)
    Write-Host $savepath
    Write-Host $filepath
    Write-Host $filename
    if ($filename.EndsWith(".exe","CurrentCultureIgnoreCase")) {
        Copy-Item $filepath $savepath -Recurse
    }
    elseif ($filename.EndsWith(".dll","CurrentCultureIgnoreCase")) {
        Copy-Item $filepath $savepath -Recurse
    }
}

Unregister-Event FileChanged