Before the information age, the best way to store data for perpetuity was in books. Perhaps that's still true as many current digital mediums still do not last for more than a handful of years. Right now, scientists are looking at leveraging sequences within DNA for archival storage based on the notion they can last for thousands of years. DNA is estimated to be capable of storing 300,000 TB of encoded data. Current experiments have successfully "saved" 83 KB of information and recovered it without error.

Johnny Mnemonic was doing that before it was cool.