Rebuilding the original puzzle pictures may not be the hardest part (still have them all listed from #1 to .. most recent), but all of those not commented footnote pictures, "help" pics, links to image upload websites or cross references will be a real nightmare to recreate. Secondly the puzzles of each member aren't listed in order, so you even have to search for particular puzzles as well.
I guess the easiest way to start is to open one's topic and upload puzzle pics again from PC's folder rather than matching chaotic filenames ...
I agree with that. It's very sad.
By checking "show own posts" on my profile page I can maybe separate my own puzzles from all my other posts. I tried this and uploaded again a picture for my puzzle N°4. I don't know how many pictures I still have on my HD, and it maybe time consuming, but I will add more when I have time. But, alas, the group puzzles will be impossible to revive.
The other thing that's really, really sad, is the "Featured imagery" section. Puzzling may be fun, but some guys (and mostly Otto), had started to build there an invaluable library of XXth century automotive imagery. I only had uploaded maybe 5% of it.
To me this is the main loss.