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zachary62
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layout: default
title: "Checkpointer (BaseCheckpointSaver)"
parent: "LangGraph"
nav_order: 6
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# Chapter 6: Checkpointer (`BaseCheckpointSaver`) - Saving Your Progress
In [Chapter 5: Pregel Execution Engine](05_pregel_execution_engine.md), we saw how the engine runs our graph step-by-step. But what happens if a graph takes hours to run, or if it needs to pause and wait for a human? If the program crashes or we need to stop it, do we lose all the progress?