While the subscriptions are evil/subscriptions are awesome and Adobe are greedy/why can't u afford $60 arguments are boring as hell, I've befall owing your ongoing side discussion about archiving and access with some interest.
Unfortunately we're only just starting to get to grips with digital archiving in a meaningful way, and to do it properly requires a comparable amount of "effort" to physical archiving. If you think of archival paper copies of things, they require particular grades of stock and ink and expensive controlled environments to maintain minimal levels of degradation.
achieving the same with your digital archives also requires work: saving archive copies in open formats as well as proprietary where possible; saving "exports" as well as source files (e.g. well-understood flat file formats like JPEG or flat .tiff, PDF, WAV or MP3 audio etc) and, for materials that you NEED to retain edit access, periodic reopen/re saves to new file formats or applications.
You mentioned that your lost CAD files were ArchiCAD? I don't know much about CAD but if you were able to export DXF/DWG, I think you'd still have reasonable access to those old files. It's a lot of effort required though, to always export archival versions of stuff. I know I don't do it...
Permanence isn't easy, even now!
Good read and I completely agree with your post. I'm not really knowledgeable about archiving, but know it's a science in itself. And a highly interesting one at that I may add.
DXF/DWG, you are right but I wasn't expecting these kind of difficulties 'back in the day' when I was just starting doing things/drawing more seriously, so didn't do it as rigorously as one should have. It's just a 'personal' loss so not that big but made me quite wary of the issue in general. Importing DWG/DXFs, as you will know yourself, comes up with issues itself but at least works (most of the time, have plenty of those that Illustrator flat out refuses to open for example too though).
Really an aside discussion. But it still boggles my mind as to why it's so difficult to make files accessable. And since quite some time now everybody and their mother creates files. We can go to the flea market / or auction houses and get photoalbums probably 100 years old but doubt that we can even open our own stuff 30 years from now.
Processing power really shouldn't be an argument so the most rational explanation would be 'on purpose' to 'move forward'..but there may be an other explanation.
You may have a link or so to a site/forum regarding that? Would really interest me in general.