"Reliable data storage" is easy. Engrave the data into a metal plate, or chisel it into rocks. It's when you start adding things like "huge amounts of data" and

"Reliable data storage" is easy. Engrave the data into a metal plate, or chisel it into rocks. It's when you start adding things like "huge amounts of data" and "readable by computer" and "able to stream in real-time" and "interoperate with multiple devices" and "fits in your hand" and and and... Hyperbole, yes, but the point is that the devil is in the details, and there's a hell of a lot of caveats to the term "reliable data storage". For example, in the modern era, if someone had a way to make ye olde floppy disks 100% reliable for 10 decades, they still wouldn't be used by that 99.9%, simply due to the low data capacity.