The History of Data Storage
By James Grahame
Here's a link to a quick and dirty history of data storage, via the ever-inquisitive Mikael S. at fosfor gadgets. It starts with Hollerith punch cards (1884) and concludes by pondering a future filled with holographic discs.
The article's most important statistic: You'd need approximately 4,500 cassette tapes to store the data on a single DVD, and it would take around 281 days of mind-numbing boredom to load it all into your Commodore 64. That said, most "backup" DVDs are full of pirated mp3s... so you might as well just record yourself a few mixtapes instead.
History of Data Storage (fosfor gadgets)