Disk efficiency, capacity and usability has all increased enormously in the last 3 decades making it more and more feasible to protect/archive content on disk long term. Here’s to the post about how heavy is an exabyte..
p.s Used purely marketing figures in the calculations (1kb == 1000bytes) .. obviously using real, tech numbers (1024) we would be looking at more disks. I Look forward to the day we can all talk in 1024.
p.p.s At time of publishing this post Samsung has announced a 128 Terabyte SSD which will be ludicrously expensive no doubt.