Just looking at the numbers, it doesn’t seem to me like archival will complete before the shutdown date (nov. 11). There are 2million+ elements left, likely 100TB+ of videos.
If you care to help them out, see instructions at the top of the page. Be sure you have a “clean connection”, though.
Not sure. They don’t mention 4 being in beta or anything. Though they don’t list much advantage of using it over 3 either.