I currently have 2 1.5tb hard drives and I am running out of space quickly. However, these hard drives are the only place I am storing things, so in case one dies out, I have no back ups.
To clarify what I mean by portable hard drive, I mean it is powered by USB alone and doesn't require any other power source.
The only reason I'm asking here is because I don't know any off the top of my head that are larger than 1.5 tb. There are some that hit something like 4tb, but those are nonportable and usually very clunky, slow, and unreliable.