Have it all on my unraid server 50Tb approximatelyNo. But your HD capacity will go down a lot haha. I'm not sure HDD capacity is large enough for 1:1 4K transfers if you have a large collection, cost of several large capacity hard drives aren't really worth saving the two minutes it takes to walk over to the cupboard open a flip case etc.
Not like CD's where you can put thousands of CD's on an affordable drive.
I run it through a mkv program and strip all the foreign audio but it doesn’t cut it down muchI think 4K BD movies are something like 60-80GB each? I'd strip audio tracks you don't want. Possibly extras ie LOTR extras
for my use 4K storage on HDD just wouldn't be economical. Doable for 1080p MKV movies as those aren't too bad.