You tube videos get deleted periodically..some last 5 years and some 5 days..if you like something alot..learn to download it..then put it on a disc too for back up..I guarantee you one day you will click on your favorites and a video will be gone-DI like the blues. When I find a Muddy Waters or a Howling wolf video I just stick it in my fav. places.I can go back to it whenever I want.