"5D optical data storage (sometimes known as Superman memory crystal) is a nanostructured glass for permanently recording digital data using a femtosecond laser

"5D optical data storage (sometimes known as Superman memory crystal) is a nanostructured glass for permanently recording digital data using a femtosecond laser writing process. ... GitHub, a subsidiary of Microsoft, plans to use this technology to archive all public Git repositories. Microsoft refers to this technology as Project Silica with a claimed lifetime of over 10,000 years." https://en.wikipedia.org/wiki/5D_optical_data_storage https://en.wikipedia.org/wiki/5D_optical_data_storage