Sure. And files sitting on a disk, any disk, are forever under threat from random failure. But would you have only one copy of that file, or two copies on separ

Sure. And files sitting on a disk, any disk, are forever under threat from random failure. But would you have only one copy of that file, or two copies on separate disks? And would you argue that it's pointless to have two copies, since simultaneous failures could still happen theoretically? If you do, I invite you to delete all your backups right now. Same with people and planets.