In this chapter, we learned how to perform a backup and restore of our VMs. As a good habit, I introduced how to create our own backup schedules for our system. If we encounter a system failure during daily operation, we now know the procedures to recover the failed node in our cluster. If the system is unrecoverable, we know how to remove it safely without affecting the production system. Finally, I introduced the configuration files needed if we want to build the cluster from the beginning.

In the next chapter, we will go through some problems I encountered during the system installation and how we can solve them. I hope it will be a good reference for you.