Hate to bring it to you but all discs except audio CDs are digital :). I think calling it "virtual" media is more appropriate. On the other hand ever since gog and others entered my life I've got lazy and I haven't burned a DVD. I know that companies can go bankrupt etc.etc. but for me downloading is much more convenient than discs. Discs take up space, I have to keep a catalog with them and nowdays it's faster to download something than getting the disc and installing it. So I have moved completely to virtual stuff.

If you really gotta have the games on discs, then you have to burn the installer - do NOT burn the files that are already installed. Just in case. And if you insist on using DVDs, but some installer is larger than the DVD storage space, then you need to split the installer in two (for example, two .rar files you burn on separate discs). edit: right, forgot that GOG already has split up large installers, doh

But like it's been suggested, a much smarter way would be to use an external hard drive. That is, if you really gotta have to do even that. The games are perfectly safe on your virtual library. To me, the whole burning-'em-all-on-discs thing is just a big waste of money, but hey, you're free to do whatever you want. Just make sure you do it right when you do.

the OP stopped coming to GoG forums over a year ago.

A new updated list can be found here: http://steam.wikia.com/wiki/List_of_DRM-free_games

I didn't buy laser writing discs but relied on good old magnetic discs, however two of them with a synchronzation tool and duplicating the folder with the installers. 2x2TB of magnetic hard disc space cost less than $200 and can be used for many other things as well. Synchronization programms are available for free. I use http://synchronicity.sourceforge.net/ because it is easy to use and reliable and does everything I want.

Why having everything two times on two discs? Redundancy. Greatly reduces the risk of a hard disc failure. I had it already once.

Audio CDs are digital too. Maybe you meant vinyl records. :p

Vynil records are digi... wait... Nevermind, I won't try a joke on someone who's forum title is Smart ass :-)

Back on topic, I asked myself the exact same question some time ago and I did go the hybrid route:
- An external 1.5 TB Hard Drive to store all of the installers, extras etc.
- For my all time favorite games I burn them to DVD with LightScribe label (expensive but looks funky :-)), put them in DVD cases with the custom DVD inserts found here on these forums and it looks gorgeous on my shelf !

Use multiple backup media: an external HDD, Blu-ray disks, Milleniata DVD-R disks, Flash dongles, memory cards etc...

Indeed... I remembered wrong :)
My point was that the antithesis for physical is not digital but virtual.

I have found something that could be useful if you don't want to burn CDs, DVDs or Bluray but want a case and not only HDD (it's not advertising, but just examples):
SD Card DVD Case and USB Flash DVD Case.

Now why are you so mean to my wallet :-)

ooo now there is an idea i really like...although i do remember reading something about SD card reliability recently.

What? CDs are digital.

I backed a few of mine up on some old DVDs, but then quit. What's the point? If they're DRM-free, they're going to be out in the Internet-verse for a long while. And I suspect that there will be better back-ups available long before GOG closes its doors.

I honestly suspect all computers to be fried by an eletromagnetic pulse or a massive solar flare before I will need a backup.

After reading the replies I am reconsidering using discs. Using an external hard drive does seem like a more sensible option. It sucks that I won't be able to have them individually available in a format that I can display on a shelf, but oh well. Saving them for the long term is my main goal here.

Another question I thought of. What about an SSD? The only thing I really know about SSD's is that they're suppose to be faster. But considering the fact that they have no moving parts, shouldn't they also be safer? Too bad they're so expensive though.

Also I'll look into prices on good USB sticks thanks to what Huinehtar posted.

EDIT: So I took a look real quick, and apparently I own 170 games here on GOG with a combined total of 260 GB (Rounding up where appropriate) required to download them all. So yeah, I would need a lot of USB sticks, or a really big SSD. Meaning more money...