-Inputs and outputs (including exceptions) to and from Durable Functions APIs are [durably persisted](./durable-functions-serialization-and-persistence.md) in your [storage provider of choice](./durable-functions-storage-providers.md). If those inpusts, outputs, or exceptions contain sensitive data (such as secrets, connection strings, personally identifiable information, etc.) then anyone with read access your storage provider's resources would be able to obtain them. To safely deal with sensitive data, we recommend users fetch that data _within activity functions_ from either Azure Key Vault or environment variables, and to never communicate that data directly to orchestrators or entities. That should help prevent sensitive data from leaking into your storage resources.
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