The difference between a task manager and a backlog is that we think a task manager provides us with structure in our planning and acting.
Few task managers do, because it’s not the tool that provides us. It’s the process around it.
A backlog is really reeeeally low maintenance, a task manager is high maintenance.
Fill your backlog daily, hourly, weekly, wenever you like. Just store ideas, prompts, frustrations, dreams, visions, goals in that one place. And then every now and then, when you have time: open it, scroll through all, prioritize. Everything with a deadline you put in your agenda, the rest is backlog.
This way you don’t end up with half-done task lists with forgotten majors and done minors all over the place. As all the others do.