I have run into similar issues with digital music. I buy a lot of songs from iTunes, and I THOUGHT I was safe and would be able to listen to those songs forever, thanks to the feature on iTunes that allows you to redownload media you've purchased to new machines and such. Unfortunately, I did have my laptop stolen a couple of years ago, and I THOUGHT I'd be able to reload all my songs on my new machine, but a bunch of the songs I'd bought had fallen off the iTunes catalogue, and now those tracks (that I paid for) are GONE. At least with digital music you can back your purchases up by burning them onto CD, (or just buy the music on CD in the first place and rip it to your machine), but I don't know if you can back up a GAME you download for Xbox... Can you? Regardless, physical media is the best way to protect your entertainment investment!