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I understand that in a snapshot-based network replication system the server holds onto N full snapshots and uses incoming ACK'd data from the clients to construct delta snapshots. This makes sense. What I have not seen a lot of information about is how the client uses that delta compressed snapshot to apply the changes.

Does the client store N snapshots so that it can reconstitute the delta compression against the reference it claims to have, or does it simply have one snapshot state of accumulated deltas? I imagine the former being correct, but the latter being less memory.

I've read How would a game-state snapshot system be implemented for networked real-time games? and and other answers, looked at Fabien's post, and read a couple of articles by Valve, but I am still unclear.

Any thoughts on this?

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