WMPRO, WMMINI FW >= 1.0 WMMEGA FW >= 2.0

Backup the contents of NVRAM to a file on the SD Card

$filename: Full path and file name for where to store the NVRAM data

Integer number of bytes written, or 0 if unsuccessful

<?
  $res=nvram_backup("/mybackup.dat");
  if ($res > 0) {
    print("NVRAM Backup File Size: ".$res);
  } else {
    print("Backup failed.");
  }
?>

nvram_restore() - Restore the contents of NVRAM from a file