Not sure exactly what you mean by 'plug and play' or precisely what you are looking to do, but you can use an external drive to archive and play back material originally recorded on the main hard drive. However it needs to be formatted in EXT3 if you wish to have files larger then 4GB. Once plugged in, you need to call up 'media' and then press the red button to 'change device', and toggle until USB1 appears at the top. You can then copy to (using file manager), or play back from the external drive.
Hope this helps