Elsa comes with a number of persistence providers, such as MongoDB, EntityFramework and YesSQL. But if none of these meet your need, you can implement one yourself.
Workflow Definition and Workflow Instance Stores
When implementing a custom persistence provider, you can choose to implement a custom provider for any of the following abstractions:
This allows applications to retrieve workflow definitions from file storage for example, while persisting workflow instances to a database.
Checkout one of the existing implementations for complete examples.