No tool is as versatile as pen and notebook. The limitation is that you don't have access to data / images / tools. Indexing the notebook to a filesystem wher

No tool is as versatile as pen and notebook. The limitation is that you don't have access to data / images / tools. Indexing the notebook to a filesystem where each subject in the notebook has an affiliated folder, and the filesystem gets backed up to storage regularly, with occassional archival storage (basically freeze a picture of the filesystem to a USB drive once a year and store it somewhere safe) is a decent approach.