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Snapshots optionally cache a project’s VM state to speed later starts. They are independent from Setup: Setup can always be saved and tested with a fresh run whether Snapshots are enabled or disabled. The public interface intentionally exposes one setting only: 
{ "enabled": true }
Enabling Snapshots immediately starts the first real snapshot build unless a matching current artifact can be reused. The update response includes initialBuildId while that first build runs, or reusedSnapshot when no new artifact is needed. If the first build cannot be admitted or dispatched, Snapshots remain disabled.