I wasn't bothered about the size, I never get anywhere near my quota, but I left it until half of Oxfordshire wasn't streaming the World Cup through my exchange
Actually, I'm not sure that it is, especially if there have been changes to the Firmware. In mervt's case though it isn't clear if the update has worked.
Archive and Install. Personally I'd only try it as a last resort if I hadn't practiced on a few machines beforehand. On second thought, I'd probably clone the installation to my external drive with Carbon Copy and then play with the cloned version.