The policy change at Data Crystal is an executive decision by the site's owner, so there's not much that can be done about it. I wrote to him the other day and pointed out that that the Rockman pages still have useful info, so he's agreed to keep them around for awhile, so we at least have a bit of time before everything goes up in smoke.
That said, I could make archival copies of the hack lists if that would make it easier for you. If I can help by adding links to hack pages, I'll try to do that, too. Also, I have IPS patches for many of the hacks listed, so if you think you might want to host any of them somewhere here or put them in an uploader but can't find them, let me know. I may have what you're looking for, or I may be able to track it down. Let me know if there's any other way I might help.