persisting the flow in the middle

Hi,

I have a simple flow with 25 screens. I would like to provide the abililty to persist the data and to continue sometime later. I believe the persistence could be achieved via database or the object /file serialization. Is there any documentation on how to persist the state ?

Thanks.

There is not yet a tutorial on writing a custom FlowExecutionStorage strategy. That is likely what you want to do though - see the existing type hierarchy for the FlowExecutionStorage interface.