Comment by londons_explore

The best format for archiving is many formats.

Make an LTO tape... But also make a Bluray... And also store it on some hard drives... And also upload it to a web archive...

The same for the actual file format... Upload PDF's... But also upload word documents.. And also ASCII...

And same for the location... Try to get diversity of continents... Diversity of geopolitics (ie. some in USA, some in Russia). Diversity of custodians (friends, businesses, charities).