https://www.inkandswitch.com/local-first/

Seven ideals for local-first software

1. No spinners: your work at your fingertips
2. Your work is not trapped on one device
3. The network is optional
4. Seamless collaboration with your colleagues
5. The Long Now [data is usable even if the app you made it in isn’t]
6. Security and privacy by default
7. You retain ultimate ownership and control