- **Verify that your functions are stateless.** We [recommend that your function executions be stateless](../azure-functions/performance-reliability#write-functions-to-be-stateless). However, we don't prevent you from writing data to the local file system. While the files on the `%HOME%\site` drive should be only those required to run the deployed application and any temporary files, it's possible to store runtime application state on the `%HOME%\site` virtual drive. If your application writes state on the app shared storage path, make sure to plan how you are going to manage that state during a resource move. If your scenario requires you to maintain state between function executions, consider instead using [Durable Functions](../azure-functions/durable/durable-functions-overview.md).
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