I am concerned that uploading the videos to YouTube isn't archiving. I realize they perhaps maintain their own backups of the digitized versions, but one cannot otherwise preserve them by sharing them with the world via YouTube.
I realize perhaps the intention of uploading to YouTube was more to advertise this project, rather than actually archiving it.
Distribution should be done via a website with links to files, e.g. ESO's gigapixel mosaic of the central parts of the Milky Way, a full size of 24.6 GiB [1]
Vimeo specifically has an option for allowing the viewer to download the video. I use this frequently when sending videos to clients. They can download the original file, and I don't have to use dropbox. Win-win
Unless it is licensed under Creative Commons, in which case they themselves provide a download button.
I used to work for a company that had a 16-bit film recorder that did this. The recorder was very finicky to environmental conditions especially related to humidity.