I am currently using a G-Drive 2TB ext/hd with 2017 27” iMac Retina display computer. I’ve had zero issue. Recently I watched A Scott Kelby video about organizing photos in LrC and he is adamant about 2(+?) ext/hds. I only have 15,300 photos. I’m a hobbyist, not a working professional so I don’t anticipate my library growing by leaps and bounds. Do I need or would it be wise to get a 2nd ext/hd? Do I really need more than 2TBs? Do the ext/hds need to be the same? All the ones I viewed on Amazon had USB/C connections. My iMac has the older USB ports which shouldn’t be a problem with an adapter, or is it? Kelby also said that ext/hds will die on you and then you lose everything unless you have the “cloud”, which I do… thoughts please…