I wouldn't trust anybody's cloud, not Amazon's, not Apple's, nobody's. Apple has shut down storage on the net a couple of times already within the life of the last OS. Or, more generally, tell me, what do you run data on that you generated with an MS-DOS or CP/M computer, or those cute little Olympus tapes on which you stored data off your Epson PX8/Paris laptop? Or even floppies, or Bernoulli discs.
Write it down on paper! I keep a box of papers, and make printouts, and put them in the box.
Andre