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There is not much info about using an asynchronous task in substrate docs i.e. task_manager in service.rs

I want to know when one should be using offchain-worker and when one should use background asynchronous tasks.

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To my understanding, tasks are some client-only properties.

OCW has the ability to access the runtime directly. It's much easier to query the storage and submit some off-chain extrinsics.

Examples:

If you want to watch your disk usage periodically, use the service task.

If you want to submit the I'm online messages periodically, use the OCW.

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