Replication is the easy part of interplanetary continuity to admire. It offers a clear visual promise. If Earth fails, the Moon has a copy. If the Moon falls dark, Mars still remembers. The harder part begins after the copies survive.
Continuity across worlds is never only a storage problem. It is an authority problem. Once multiple nodes hold valid states, someone has to decide which copy becomes operational, which copy remains reference-only, and what level of divergence is still acceptable before a new arbitration cycle begins. Long latency makes this worse because disagreement can persist while all parties continue acting locally.
This is why interplanetary continuity increasingly looks like governance infrastructure rather than pure technical elegance. Operators need rules for quorum, re-entry, and contested promotion. Regulators want to know whether one jurisdiction can force a demotion elsewhere. Customers want assurances that the copy they rely on will not be downgraded after the crisis has already started.
A mature continuity system therefore needs an arbitration layer sitting beside its replication layer. The copies do the surviving. The arbitration layer decides what survival means.
Without that layer, redundancy can preserve too many truths at once. That may be technically impressive. It is rarely operationally stable.