Akka.NET makes building concurrent, scalable, reactive, self-healing, and distributed systems easier. Even though Akka.NET actors help you to manage concurrency, by default they only exist in-memory. In this course, Akka.NET Persistence Fundamentals, you're going to learn about the core features of Akka.NET Persistence and how you can use these features to restore the internal actor state if the actor restarts or the server crashes. First you'll learn how to refactor existing actors to be persistent. Next, you'll learn about how Akka.Persistence supports multiple back-end data stores. Finally, you'll learn how to improve actor recovery speeds by using optional snapshots. By the end of this course, you'll understand how to get started creating persistent actors that can restore their state, how to configure a persistence back-end store such as SQL Server, how to think in terms of events and commands, and how to implement performance-improving snapshots.