A staggering amount, is the answer.
>In 1991, a gigabyte of hard disk storage cost around $10,000, perhaps a touch less. (Today, it costs around four cents ($0.04).) Back in 1991, a gigabyte of flash memory, which is what the iPhone uses, would have cost something like $45,000, or more. (Today, it’s around 55 cents ($0.55).)
The mid-level iPhone 5S has 32 GB of flash memory. Thirty-two GB, multiplied by $45,000, equals $1.44 million.
And that's just the storage. It's astonishing just how far we've come in a little over twenty years, and it demonstrates how difficult it is to make predictions for the next few decades.