onydium

Onydium is a malleable, precious metal that is impervious to corrosion, making it ideally suited to long-term storage of data and materials. Found only in scattered nodular deposits on some rogue asteroids, onydium is quite rare and therefore typically reserved for items of vital importance such as financial records, fine aged liqueurs, and holopics of certain Confed officials engaged in perfectly legal, consensual, yet politically suicidal activities that will never get leaked to the telewaves as long as payments to certain encrypted accounts continue to be paid. Hypothetically.

Update: As this edition of the Handbook went to press, scientists discovered that onydium nodules are actually astromoth cocoons. Further research is still being conducted to determine the conditions under which astromoth cocoons actually hatch.