Cloud computing - Best example/description of what cloud computing could represent 100+ years ago(for a paper)?

Anytime period of at least a 100 years ago. So back then what would be the best example of how cloud computing works. Need help for my paper. So again what can cloud computing best be depicted as from history.Cloud computing - Best example/description of what cloud computing could represent 100+ years ago(for a paper)?
Cloud computing implies remote storage, backup and access, so libraries come to mind.

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