And if you're only storing still images, Amazon Cloud Drive has a $12/year plan (or, an exact clone of the same tier included with Prime right now) for unlimite

And if you're only storing still images, Amazon Cloud Drive has a $12/year plan (or, an exact clone of the same tier included with Prime right now) for unlimited photo storage, which is practically a steal if you take a lot of pictures and not a lot of video. It's cheap enough that I can use it as a cloud copy or a second cloud copy, and I never have to worry about losing photos again.