Not a ton.
A few hundred DVD s and blurays, maybe a dozen vhs, and maybe a half terabyte of digital.
My thing about physical film media is the extras. Music? You can snag liner notes and cover art easy enough. But a good DVD is going to have all kinds of extras, navigable in one place with less effort. You often have better sound, and you definitely have less hassle with subtitles or alternate dialogue tracks.
The thing I hate is that no storage media is eternal. I've had hard to replace movies just fail completely due to age.