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Multi-device sync is planned, but the local-first model is the constraint. A traditional cloud sync rebuilds the central honeypot Retina is designed to avoid. The current plan uses Arcium Multi-Party Computation. Portfolio data is split into shares across nodes such that no single node ever sees the raw input, and reconstruction only happens on your client. The end result is sync across your devices without any single server having a complete view of your portfolio. This is not shipped. Today, Retina is single-device. See Roadmap for sequencing.