Youth with You Backstage is basically the additional footage from the practice. It expands on what was shown in the episode, giving viewers even more opportunities to get to know the members and witness their hard work.

I appreciated how often the trainees shown in Backstage were the ones who might have gotten less screen time during the episodes themselves.

Is it worth buying VIP just to watch it? No. But taking into consideration all the other additional materials linked to YWY Season 3 like Youth Party which are available for VIP users, all in all, it's worth the money - IF you like the program and the trainees themselves.