Too Long; Didn't Read
The Scrum Guide makes no mention of when, or how, to create the Product Backlog. It's up to you to decide what technique you'd like to use. I'm going to share one that works well for me and is in common use. The skill is in keeping it simple and focused. There are different techniques for doing all of these and I'll cover that in a separate article. If you want to learn more about Product Management techniques, why not join one of my Product Owner classes?