Sync your notes across devices - Obsidian Help
Syncthing - Obsidian Hub - Obsidian Publish
https://peter-nhan.github.io/posts/SyncThing-Obsidian
Also See here to copy what files to ignore with syncthing: Ignore Patterns for Syncthing
obsidian Softwares I install syncthing-macos - native macOS Syncthing bundle