obsidian-livesync/docs/tech_info.md

Designed architecture

How does this plugin synchronize.

1. When notes are created or modified, Obsidian raises some events. Self-hosted LiveSync catches these events and reflects changes into Local PouchDB.
2. PouchDB automatically or manually replicates changes to remote CouchDB.
3. Another device is watching remote CouchDB's changes, so retrieve new changes.
4. Self-hosted LiveSync reflects replicated changeset into Obsidian's vault.

Note: The figure is drawn as single-directional, between two devices for demonstration purposes. Everything actually occurs bi-directionally between many devices at the same time.

Techniques to keep bandwidth consumption low.