It's contextually bounded, I think. You can't be the librarian of your whole life, but you can parcel out some things that warrant discrete records(e.g. finances).

I do think it's pointless to put all of it in a computer. Some things do better with a whiteboard(or an electronic version of such like Boogie Board) or a paper journal. The computer is for if you genuinely want to edit, rearrange, and structure the data. It constantly tempts you to do so.