If your recipes are formatted like markdown, then there are offline notes apps like Obsidian. The new issue becomes keeping your files backed up in case of whatever, and that’s when the self hosted server comes into play. This is a really good usecase for synching which can keep your small recipes files duplicated on your phone and your computer without ever leaving your network.

I tried to set up some services last year and had some trouble getting immich to work through networking. The answer was tailscale. This past Christmas holidays I got nextcloud and immich up. I use nextcloud for my audiobooks and large files I want to keep but not on my phone. Immich for pictures and synching for small files I want synced often like my epub book arks and highlights and Obsidian notes vault.