Finally Sony has addressed the archiving issue.
http://www.gamespot.com/articles/sony-a ... 0-6418200/
Today, Sony officially announced the "Archival Disc," described as a next-generation iteration of its Blu-ray format that can house up to 1TB of data. Currently, Blu-ray discs, like the ones used for PlayStation 3, PlayStation 4, and Xbox One games, can store up to 50GB of data.
Sony describes the Archival Disc as a "new standard for professional-use, next-generation optical discs, with the objective of expanding the market for long-term digital data storage." The Archival Disc was developed in conjunction with electronics giant Panasonic.