combined hd space
4 2 tb's
and 1 1 tb

and currently an internal 40 gig ssd and 160 gig hd but i dont really count those

my gog games amount for around 400 gig ...ish

That's the beauty of DRM-free: the ability to back up your games! Having the installer is so much better than having to rely on an always-online client with no real installer. :P

You're giving some good ideas here :-)

My plan was to put all on Blu-rays but I've been lazy just burning a part of it so far :-) I do, however, like the hard disk idea - I guess I have some spare 500 GB around that won't suffice anymore for system backups. The question of durability of media is a good one. I remember some Blu-rays of a certain brand I've burned which are now unreadable ...

I also like the NAS ideas but haven't ventured to make a big investment - I have some slow D-Link NAS with 1 TB disks I "bricked" but my dream would be to build something of my own with probably FreeBSD on it but that can be quite expensive :-)

Currently I have all GOG games backed up, but I intend to go through them at some point and get rid of some that I don't have any interest in ever playing (which probably will include most of the free games). I did the same with all the DRM-free games from humble bundles and the like.

I have 3x 3TB externals, but only one of them has GOG games on it.

Every single game, yes. And I thank the team of GOG that I am allowed to do that.
If I ask how to backup patches from my Wii U or Ps3, people look at me as if I ask how to teach a goldfish to fly.

It’s all on a USB flash drive, in a locker at Heathrow Airport, guarded by a retired German wrestler named Helga.

and soon 12 tb !

ahem anyway
you may not see the point
i do

and i have to use them

That kind of thinking means you never buy anything because something bigger and better is always right around the corner.

Nothing yet, but I just started using GOG and only have a few games on it. Not too worried about it...yet.

Don't wait. You'll have a ton of games not backed up before you know it.

I have all my games backed up on two internal drives and an external drive. I back them up as soon as I buy them.

Me! Not because i am afraid of GoG shutting down, but because games get regularly updated! Certain ones, have certain exploits, or better experience, in previous versions! Latest doesn't always mean best!

Nop, I buy when I absolute need it, or when it becomes a problem, or when it is so cheap that my reasoning is suspended. Rarely before.

When I can get on nicely without purchasing something for so long, most likely I do not need it.

This kind of thinking let me survive the smart phone hype. When people are changing into iphone 2, 3, 4, 5, 6, I still can use my 5 year Nokia phone. I rather like that, it can drop many many times and will be still functioning. I only need to charge my phone once per week instead of smart phone daily / half day battery charge.

New is not better, as KiNgBrAdLeY7 says, Latest doesn't always mean best!

I back up my games once I download them to play. I'm not actively downloading everything only for the purpose of backing up, though.