A paper notebook with todo lists. In my original industry (mechanical engineering) I was taught to maintain notebooks with glued spines (i.e. not binders or coiled-notebooks that can have pages removed/added) in case you ever have to defend yourself within a company or even in court. Over time I have developed a system to keep todo lists in my notebooks.
Generally, I have one "backlog" list and one "current" list. Whenever a task comes up, I make a small box ("⃞") and a description in one of the lists. I fill in the box when a task is done ("■"). Every 1-3 days I start a new current todo list by striking through remaining items off the old one and writing them in priority order in a new list, writing them in backlog, or deciding they don't need to be done, ever ("⊠"), or delegate to someone (strike through with an arrowhead and note about the name). Every week or so I do the same thing with the backlog list. I always write the date at the top of the page when I start a new list, and very rarely note dates for starting/finishing tasks.
I see a few benefits with a notebook system. 1) It takes some effort to rewrite tasks so it also encourages me to just do 5 or so low-effort tasks for 20 minutes instead of re-writing them. 2) If I need to focus on some particular tasks, I can make a priority list in a very deliberate order, finish it and then go back to my current list. 3) I can look back at my old lists and see patterns in struck-through vs checked-done vs X-d tasks vs delegated tasks
I also take notes (for meetings etc) in the notebook, and when needed for work, rewrite them in confluence or whatever. At the top right corner of pages which need an online version, I draw "⧄", and I fill it in as "◩" when it's actually online. It's saved my ass a few times to use my notebook to say "well we met on x date, and I put the notes online with you tagged so you should know this" or "I see here that I marked this task as done, and thinking back I sent you a message about it". It's way faster and more credible in the moment than opening your laptop and searching n number of services for communication.