I have a "smart pen" that saves anything I write as a PDF on my phone that can be searched and stored where I choose (including cloud services).
The downside is that you have to write on special paper or in special notebooks. But it's not as terrible as it sounds because the notebooks are very reasonably priced.
These are pretty useful as a note taking tool personally, and avoid scanning etc. I've never converted over but have had colleagues use them exclusively.
PDF's are a terminal format though, and doesn't really meet the need of a persistent, editable, graphic format for diagrams.
I have a "smart pen" that saves anything I write as a PDF on my phone that can be searched and stored where I choose (including cloud services).
The downside is that you have to write on special paper or in special notebooks. But it's not as terrible as it sounds because the notebooks are very reasonably priced.
It also works as an actual pen.