Buy it on: Amazon
These Seagate HDD options provide a vertical, elegant design to set next to your Xbox One X. The upside here is that the drive doesn't take up as much horizontal space as the oddly shaped, rectangular external HDDs with smaller storage capacities.
For less than a hundred bucks, this is an excellent mid-range external option that ensures you won't be deleting games, while not hitting the bank as hard as with those 8TB behemoths. Of course, all the usual standbys like Toshiba and Western Digital have their own versions of these as well at differing price points, so you've got other options if you're considering this style of external hard drive.