serpantino: Anyone with a large game collection stands to lose out if GOG goes under. There's talk of backing up all games offline but realistically, not everyone has a strong enough Internet connection and if the masses of users start doing that then the servers are going to crawl.
I must admit I am one of those who just don't understand why when it comes to wanting DRM-Free, that you don't download each game you buy as soon as possible.
If you buy a game with intent to play at some point, you are going to have to download it.
One of the major benefits of DRM-Free is to be independent. You are not independent if you haven't downloaded your games. So letting them build up is silly and only making it a more onerous task in the end, and a huge risk.
Stores close all the time, and a unique store like GOG is always under threat because many in the industry do not like or support it. I consider it a remarkable feat that they have lasted 12 years, honestly.
It takes a good while to fill a reasonable drive, which should be plenty of time to save up for the next one. If you have filled a drive, then you must have spent a bit of money, so must be able to afford a new drive, else you have your priorities screwed.
In reality, you should have at least two copies of every game, on separate drives, as a drive can die any time, and it takes such a damn long time to copy files. You have to stay ahead of the curve or you are doomed to fail ... potentially all that money down the drain.