When Gordon Moore, the co-founder of Intel, first stated in 1965 that processing power would double every two years, everybody thought he was a complete loony. But not only was he proven correct on that front, but the same thing happened to storage space. It's almost impossible to believe, but back then computers were rated in kilobytes, and those alone cost hundreds of thousands of dollars and were reserved exclusively for super computers.
Only a short few decades on, and we were fitting 100,000 times that amount on a piece of plastic the size of a large bee. Ten years after that, and we can fit a quarter of a terabyte onto the same piece of hardware. For the zero-lovers out there, that's 250,000,000 kilobytes. Even better, you can pick up that much storage for about the same price as a restaurant meal. Insane, isn't it?