Seagate tempts a lot of buyers with its high capacity and low prices. Apparently it used to be a decent company over a decade ago, and a lot of geeks still remember its reputation and consider it a "good brand." But it hasn't been a good brand in a long time, because every Seagate hard drive I've bought has failed or had major problems. This one was no exception--one day it was just a brick. Especially since these things are marketed as backup, users tend to think of them as secure and assume their data will be safe on them. You might as well be strapping your data to a ticking bomb and walking away from it, especially if you buy a Seagate. Lesson 1) don't use any external HD as your sole backup. Lesson 2) don't buy Seagate.
WD is a decent brand that's served me well. I have a WD 1 TB drive from 2008 that's still chugging along without errors in 2017, and another WD drive that's a couple years old still working fine. Yes, they cost a little more, and buyers on a budget tend to see Seagate offering some drive twice the capacity for the same price--you might see a WD 1 TB for the same price as a Seagate 2 TB. Well, nothing in life is free, and I don't know anyone who only needs 2 TB for a few months and is fine with that capacity AND all their data being toast after that. The only reason to want large capacity is if you're storing a lot of stuff, which obviously you want to last. If that means getting half the capacity because that's all you can afford, it's still worth it to not have a brick in a few months.
The only positive thing I can say about this is that the power for it is modular, meaning if just the power supply breaks, you can buy another one for $10 or so on Amazon and repair your drive. I was able to fix it once when the power was the problem rather than the drive--and that's a feature more drives should implement, since it makes a common problem easier to fix yourself, without buying a whole new enclosure. But later on what broke was the drive, not the power supply, so there was no fixing that. Also, for whatever it's worth, I've had the power supply break more on Seagate drives than any other brand, so it seems a workaround for selling such an inferior product. It's nice to be able to fix some problems, but it would be nicer if everything about it wasn't made to break in a few months.