There are software out there that will download and save video clips. Here is one I have used in the past and its free:
http://www.ashampoo.com/en/usd/pde/0155/Multimedia_Software/Ashampoo-ClipFinder-HD/Details
In the future, save the videos themselves instead of bookmarks since as you know now, they can take videos down, move the links, and do other stuff. If you have a copy you can upload it and share it anywhere. And this software compresses the videos so they don’t take a lot of space. You can organize the videos into special folders like you would any other kind of document or file.
Thanks ,,, I will save it and use it often in the future .