As well as being a TB in size, we'll never see the day it gets full.
15 years (rough guess) ago we thought we would never need a 12MB drive
As for back-up I would prefer a HDD. The space/$ is sooo much better than SSD that I don't see how to ''defend'' buying a SSD unless you have a pool build of diamants and filled with liquid gold.
Mugen MBX6Te RCM + Mugen MBX6e RCM + Savage Flux XL FLM + MERV all with Spectrum DX3S || WTS&WTB