hedwards: Spoken like somebody who has a really good internet connection. Even back in the US, it would take me hours sometimes, or longer, to download something again.
But, anyways, there's always the possibility that GOG will go out of business, or Steam for that matter, anybody who isn't backing up those files is pretty much asking for something to happen.
Doesn't excuse it, but there's no reason to leave oneself vulnerable.
mxh178: That's not really the point, though, right? If the uncertainty surrounding your GOG collection is so high that you feel obligated to download and save a backup of everything you own, that seems like a problem to me. And the events described by the OP increase that uncertainty.
If you do it out of habit or for fun, that's your own thing. But if it becomes required (or if it feels required because you're not sure if you'll own something tomorrow) that's bad.
I do that with every gaming service and every media service I buy from. I've been burned by not doing so in the past.
EDIT: It's naive to the point of ignorance to not acknowledge the point. It's unlikely that we'll be given any advance notice on any site that goes under.
hedwards: Doesn't excuse it, but there's no reason to leave oneself vulnerable.
PhoenixWright: On the contrary, this seems to be spoken like someone with a really good internet connection. Use case: you bought a bunch of games in a sale, and have neither the speed nor the unlimited bandwidth to download everything at once. Not to mention the fact that GOG *does* offer a library, and unfortunately you're right simply because we know that one's GOG library is not safe from issues like this.
This doesn't really address the notion that one should retain copies on hand of all the games one buys. In fact it really reinforces the notion as if ones connection is that slow, one shouldn't be deleting games one buys.
But, it's ultimately a moot point as anybody who has a connection so slow as to make it impossible to download what their buying either needs to buy fewer games or find a way of getting a better connection. Probably the former as the latter would probably have already been chose.
GOG does have one, but ones internet can go out at any time, in the developed world that's usually rare, but who knows. Plus, if ones power goes out, one can still play on a laptop without prior knowledge that power is going out. I think playing Zork in the dark is awesome.