I agree a major attraction of NoGrip was their well organized download library plus the fact they hosted all those files.
As opposed to those sites where, from the time you click the alleged "download" button until you are actually downloading a file, you have opened four more tabs, solved a capcha, typed the five characters in the space below, waited 15 seconds and clicked the yellow arrow, and "your download will be ready in 60 seconds" (and/or, even more egregious, you notice that 120meg file is downloading at 35k/sec unless you want to subscribe to the hosting site).
It will be a shame if those libraries are lost, and permissions to upload elsewhere will be difficult to impossible for some files; some modders have passed away, others have left the community over the years. I have long lobbied for an "abandonware" style attitude towards such files - make them available in their original form with all original documentation, noted that they are available without explicit permission, and a note for the creators that they will be immediately removed if requested (just voicing an opinion, this is not the place for another debate on a contentious topic).