Majority of you seem to have a misconception when hoarding movies
The 4k version of a movie is NOT the superior version by default. Movies or series recorded on (analogue) film, which in general is anything before 2000, 9 out of 10 times it's just an upscaled version of the 1080p rescan. From 2000-2010 digital cinematography gained pace and has to be looked into case by case. Only few films get a proper 4k rescan (which then can look marvelous indeed); some film can not be scanned in 4k or wouldn't see any benifit due to the type of film used. Upscaling almost always fcks up something; contrast, fine details, introduce artifacts and more. A very popular thing to do is degraining or cleaning the picture of noise which is a universally hated process by videophiles. The difference in picture quality becomes even more apparent when you look into cel animation. Some of you prefer the shaved look knowingly, i know, but i fear most people just don't know anything about this.
Anyways, instead of shelling out money for always bigger and better drives, hoard the proper rescans in 1080p. I feel 4k torrents have (unjustifiably) better traffic as the years go by and god forbid the og FHD versions disappear at some point.