Kind of pointing out the obvious here but there are 20 and 22TB drives where you can back it up to.

if the HTML is already to big then any picture would be insanely long

make screenshots from the same source as in both from TV or both from VLC. I have a feeling VLC is doing some stuff here and the same is happening on the TV.

SSDs are already at 100TB at datacenters type stuff. expensive as f*** but it exists.