Thanks for all that effort keeping this backed up.
External images (which I use for all my puzzles too) are a risk for loss.
Here's an example that's a bit sad:viewtopic.php?f=15&t=10842
It looks like the linked images are no longer online. I remember them being the first 24 cube images, with some mechanism pictures.
I'm not sure what the solution to this particular problem would be.