Siannah: I'm aware that HDs are inexpensive nowadays
I don't know what media you use; but based on the way you've been citing the failure of backups, I wasn't sure sure you were cognizant of the fact or is it just hyperbole &
FUD.
According to your example, we're talking about 4x 8TB for $980 + $100 for the bay. So roughly $1000 for a single 16TB Raid 1 system.
I didn't explicitly list it; a Raspberry Pi with the case in which to mount it plus miscellaneous connectors, et cetera, is about $45; a little bit more if you want a mini LCD display, that is not necessary because it can run headless and I can temporarily hook up my 24" monitor if I need to directly access it. Also $10 per drive for Amazon to handle replacement & data recovery in case of failure, I haven't had one fail yet. I said I have 2 of these in separate physical locations so that's about $2200; extra redundancy and all that.
just for backing up games
More hyperbole?... I don't know how much of a pack rat you are; but all of my music, videos, pictures, retro & other gaming and any other miscellaneous software & other data fit in about half that. Since they're in external bays I can just add more when it becomes obvious that I'm going to run out of room.
Note that we haven't even touched hard drive life expectancy or possible failures of Raids (there's a reason Raid 5 exists).
Take note of of my earlier mention of of paying $10 per drive for Amazon to handle replacement & data recovery in case of failure, I haven't had one fail yet.
If that's feasible for you, by all means go for it.
Obviously I already have. If money is a reason for lack of feasibility one can use 5TB drives in a 4 bay enclosure and pay the extra $10 each for a total of about $630 for. With an Amazon store card one can get terms that include 12 months same as cash if paid in full within that timespan for one time purchases of at least $500 or 6 months for purchases of at least $150.
It isn't for me and I doubt it is for the majority around here, even less so as a general rule.
You can't pay off $630 in a year, but yet you're willing to spend money on digital downloads without being able to rely on backups; especially those that aren't DRM free? You've polled the entire membership of GOG to determine that more than half of them ("the majority around here") aren't able to pay off $630 in a year? I realize not everyone can do that, but I'm not going to assume whether a significant amount can or can't. This is intended to be informative.
If one really wants to do it on the cheap, get 2 5TB drives and use them in an 2 slot enclosure. Use one to do daily backups and once a week or so plug in the second just to mirror the first removing to second when done to reduce wear & tear. This can easily be done for less than $300. With an Amazon store card one can pay that off over 6 months.
Siannah: I have over 900 GOG titles in my account and my GOG folder is 1,38 TB big. Fact. Yes it's getting to a point, where it's not feasible (at least for me) to backup all my games.
You've obtained 900+ games, but yet it not feasible you to buy another hard drive? I understand it's none of my business, but if it was me I would re-prioritize my purchases so I could at the very least buy a 5TB hard drive (these seem to be the optimum sweet spot of size versus cost) and an enclosure. One could easily do that for less than $160. I would hate to lose 900+ games & whatever other data I might have.
You still haven't given a well reasoned response as to why you're so quick to dismiss backing up installers from DRM free retailers instead of relying on the goodwill & continued existence of an authorization server based service other than to infer that because DRM free services & backup media are potentially unreliable, and that hardware is expensive & subject to failure so one should bother to use or consider alternatives.
I prefer to be much more proactive. I'm not willing to rely on the goodwill of of any outside party that can unilaterally end my access to my lawful purchases and leaving me with no effective recourse. I am also unwilling to throw my hands to the sky, shove my head in the sand, say to myself,
Siannah: I have no idea what happens, when the day comes where it shuts down or how / what Valve has planned for such a case. But let's face it: neither do you or anyone else.
fatalistically accepting the status quo.
Shamus Young has already explained, over 7 1/2 years ago,
how if a company becomes insolvent to the point that they are bought out, go into receivership or declare bankruptcy, whoever promised to remove the DRM are most likely not going to be in the position to do so much more eloquently than I could have. With backed up installers from DRM free retailers one does not have to be concerned about this.