Recursively get files in SharePoint

SP-GetFilesRecursive.ps1

$spWeb = get-SPWeb "localhost"

function getFiles ([Microsoft.SharePoint.SPFolder]$parentFolder) {
    $files = $parentFolder.Files

    foreach($file in $files) {
        Write-Host $file.Name $file.TimeLastModified
        $b = $file.OpenBinary()
        $fs = New-Object System.IO.FileStream(("\\server\exportfiles\"+$file.name), [System.IO.FileMode]::Create)
        $bw = New-Object System.IO.BinaryWrite($fs)
        $bw.Write($b)
        $bw.Close()
    }

    $folders = $parentFolder.Folders

    foreach($childFolder in $folders) {
        getFiles($childFolder)
    }

    return
}

$rootFolder = $spWeb.GetFolder("Lists/My Doc Sets")
getFiles($rootFolder)

Line 15 $folders = $parentFolder.Folders
Should be $folders = $parentFolder.SubFolders
That runs, but now something with my filestream, as it moves filename into export location, but file size is 0kb.
But this helps a ton, thanks Paul!
-TRM