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Distributed Snapshots: Chandy-Lamport Protocol
Some forms of distributed snapshots were around for a while already when Chandy-Lamport's distributed snapshots paper was first published in 1985....
The paper has a good visual representation: imagining you wanted to take a picture of a sky filled with migrating birds. As a funny insight, the paper also references " LAMPORT, L., AND CHANDY, K. M. On partially-ordered event models of distributed computations. Taking a global snapshot in a distributed system is hard because of the lacking of a shared clock and metaphorically, it's like trying to stitch multiple pictures of a sky in a consistent way.
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