Gold film with holes lasered into it should last indefinitely. Probably the longevity of the reel, container and building are more of a problem.

Github's backup on Svalbard also uses some kind of film, and it's supposed to last 500 to 1000 years: https://en.m.wikipedia.org/wiki/Arctic_World_Archive

We have data from thousands of years ago that has survived on stone tablets, papyrus, etc., but we don’t know what the failure rate is. The surviving items might be 1% of the originals.

The best way to preserve data long term is to make lots of copies, distribute them widely, and migrate the copies onto new technologies periodically.

The Rosetta Project had (has?) the goal of storing a modern day Rosetta Stone[1] on nickle disks etched with nearly 14,000 pages of text in eight human languages. They expect that with minimal care the discs should remain legible for thousands of years.[2]

[0] https://rosettaproject.org/

[1] https://en.wikipedia.org/wiki/Rosetta_Stone

[2] https://rosettaproject.org/about/

Paper in a box does not last forever--less than 100 years. It can last longer with the right paper and in climate-controlled environment. But this is not passive storage, you have to use energy every day to maintain the facility.