Store Pending message

[Vezna14]

Hello,

I have a use case where I need to persist messages until i have the confirmation that a client have received it.
From my understanding, the Quality of Service options can do that but the messages a queued in the RAM.
I would like to know if there is a way to change that so the messages will be stored in a file or an internal message queue like MSMQ. It will probably be less efficient but in my use case, keeping messages in memory is not suitable.

[ChrisProlls]

Same for me :)
I would like to backed the queing with a storage (SQL Server, CosmosDb whatever) so that if the service restart it doesn't lost his messages. Isn't that possible ?