I write down everything I'm asked to do or decide I need to do in my own personal backlog spreadsheet. It's my way of tracking everything I've committed to doing and crossing it off once I'm done.
I only capture the information essential to me to know what a task is and when it's due.
Color coding lets me know what's outstanding, late or done (yellow, red, green).
This is the way. This is how I stay on top of all the tasks I have to manage, both personal and professional.
Have a look at my tool for yourself.