Hello, I have one doubt, If we use a

task

with

cache_key_fn

, then that where is that cache is stored in Prefect cloud? If I use self hosted version then where this cache is stored and retrieved?

The cached results are stored locally by default in both cases. From the concepts->tasks docs:

Task results are cached in memory during a flow run and persisted to the location specified by the PREFECT_LOCAL_STORAGE_PATH setting. As a result, task caching between flow runs is currently limited to flow runs with access to that local storage path.