By paying a small subscription fee I have managed eventually to put JW videos onto a disc which can be played separately from entering You Tube Videos.
They look awful on TV via DVD Player but at least if they are deleted I can still see on computer.
If you use the FireFox web browser then you can install a free plugin that will let you save Youtube videos to your computer.
I have hundreds of youtube videos save on my hard drive.
http://javimoya.com/blog/youtube_en.php and read up on it.