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The differences mainly root from the fact that different state backends maintain working state differently, and consequently have specialized formats that allows them to introduce as less overhead as possible when taking a snapshot of the working state as well as restoring from the serialized fromform.

While for checkpoints it is completely reasonable to have state backend specific formats for more efficient snapshots and restores, savepoints should be designed with interoperability in mind and allow for operational flexibilities such as swapping state backends across restores.

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