External 4TB SSD will set you back a little. A 4TB disk, not so much, maybe $100 with an enclosure.
I just use loose drives, plop them in an external dock for simple back ups and them put them on a shelf for a few months/years at a time.
I would say there is little difference between WD (Hitachi/Toshiba) and Seagate (Samsung). And they are pretty much it that is left in terms of manufacturers. All other brands are either owned by them or they are now the true OEM after having acquired the factories.
Picked myself up a WD Red Plus the other day. Seemed to be the safest choice. CMR drive rather than SMR. And I don't really care that it is 5400 RPM, performance is not that critical but the tales of SMR drives being extremely slow at certain tasks put me off.