Nanofiche is a revolutionary archiving technology chosen by the Arch Mission Foundation for the Arch Lunar Library. Unlike other alternatives, Nanofiche is space-grade, lightweight, highly durable, and efficient. It can withstand extreme environments and preserve large amounts of analog format information for thousands of years. Nanofiche is made of nickel-based films that never degrade and never have to be replaced. It can store up to 2,000 analog pages of text at 150 dpi per square centimeter, making it a highly efficient archival solution. Compared to microfiche, Nanofiche takes up less physical space and has a much longer life expectancy. It is supplied by a single vendor, Stamper Technology, under license from NanoIP.
https://www.archmission.org/nanofiche