Video of ceramic storage system prototype surfaces online — 10,000TB cartridges bombarded with laser rays could become mainstream by 2030, making slow hard drives and tapes obsolete::Ceramics-based storage medium consumes very little energy and lasts more than 5,000 years, creators say
As far as I know, there is 1 storage technology that has survived wars. Paper.
Say that to the library of Alexandria.
Paper is notoriously easy to destroy in conflicts
There’s another, better one: stone carvings.