I set up the #Nostr relay on nostr:npub1aghreq2dpz3h3799hrawev5gf5zc2kt4ch9ykhp9utt0jd3gdu2qtlmhct to backup my notes and other stuff. Then I used this tool to backup all my old events.

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

A nice side effect is that all of my old posts show up instantly in Amethyst, rather than being limited to more recent stuff

nostr:nevent1qqsfr3jjx03ky457qthmpr0vg952k9ejk9mlnwdez0c8eza05vcm9hcpzamhxw309ucnjv3wxymrst3s9cerxvp6xsurgwqzyr02k7w6lgwzhe955mf6egf40dk25zm5f06x44ff5khyvs5g270xsqcyqqqqqqg0gmh3q