lurkingcat on Nostr: I think #[2] have created several tools like that Maybe this can help, ...

I think bordalix (npub1vt8…8cxv) have created several tools like that

Maybe this can help,

https://github.com/bordalix/nostr-broadcast

https://github.com/bordalix/nostr-backup

https://github.com/bordalix/nostr-restore

I have used nostr-broadcast to migrate all events to my private only local relay. It really helps.