Configure reliable messaging / acknowledge on QoS >=1

### Describe your question
I need QoS 1 or 2. In other words I need the message to be reliably saved on the server before the client consider it done.

### Which project is your question related to?
- Client
- Server

I configured both the client and the server "WithStorage" in order to keep the sent messages until they are sent.
If the client send a message when the server is closed, the message is correctly persisted.
After this, the server starts, but regardless I try to fail the message (ProcessingFailed=true or throwing), the client always delete the persisted message which is lost.

How am I supposed to configure the two parties to avoid message deletion upon server failure?

Thank you