Hello. As Lion will be out anytime from now, I am considering whether to upgrade to Lion as soon as it is available or wait for about two months. I recall that when Snow Leopard came out, there were various issues including compatibility problems. Right now, I am using Snow Leopard and as far as I know, Lion will not be available in disc format. Before upgrading, which method do you recommend? A full backup using Super Duper or Time Machine? Thanks.