Nirth: I agree about announcements before a game is pulled but frankly, it's cheaper for a consumer to buy a 2TB harddrive to back up everything for those "in case" situations then CDP trying to protect themselves from multiple lawsuits because they screwed up with announcements, perhaps broke a few rules that are seamlessly not too damaging but may have been created in the first place to protect other situations with some parts involved in a similar manner.
And if you can't afford that kind of drive then buy one with less memory and only back up the must-haves.
mxh178: that shouldn't be the customer's responsibility
No it shouldn't, hence GOG offered a full refund.
It is good to remember though that the ability for "unlimited" re-downloads, that we take for granted, is an extra service they (and other stores like Steam etc.) are offering. There are digital stores that don't offer this, e.g. the SFI Super Bundle I bought from the Strategy First site, where they pretty much say you can re-download the purchased games only certain amount of times, so you should really take a backup of them. And that's what I did for that bundle, 29 games.
I think this was an unfortunate case, but thank god GOG games are DRM-free and they can be downloaded over a corporate network too (what I can't do with e.g. my Steam games). If I was to download all my GOG games, I'd really need all the download speed I can get, so I'd probably do it at my work over a 100Mbit/s line.
That said, I'm downloading and backing up my GOG games selectively. Mostly that if I've already downloaded (and installed) a GOG game, I archive it. No reason to delete the installer, if I've downloaded it already.
mondo84: I really need to get a nice external storage drive.
Two, keeping a backup of the backup. :)
I'm surprised if no one didn't yet come with the "you can always download your purchased games from PBay"-argument...