Nostr has no guarantees about message archiving. It's entirely up to relays to decide how long to keep a message. Also Nostr doesn't store media on relays; media is referenced by URL to third party, centralized, media storage sites with no guarantees.
I would suggest putting this stuff in a git repo instead. That at least is easy to mirror.
What is it a git repo?
A github repository which can be also deleted if they receive such an order / court order.
Not exactly. Git is more than just github. Git is great for incremental changes, each with a commitment to the full history of the repository. If you know the ID of commit 200 and somebody is offering you a copy with 205 commits, you can immediately check all up to 200.
https://en.wikipedia.org/wiki/Git
A good example of a git repo used for journalism is: https://github.com/Enegnei/JacobAppelbaumLeavesTor
There was a nip to store media on relays. Also supertest net made a tiny that hashes up binary of media and splits it into a bunch of notes that it can reassemble. Just some cool history details.
