NintendoAge Collections are still accessible on SegaAge
Just sign in and head to collections. I exported all of mine in Excel format in 5 min. I had saved all the website snap shots from the original server, but that doesn't let you do an export anymore. SegaAge will let you export your collections.
I had used both sites, not sure if your NA login works on it if you never used it prior.. hope it does!