Well, paper, yes, but usually not pen. These days, it's better to use printers to put more substantial and important information on paper. That way, we get the

Well, paper, yes, but usually not pen. These days, it's better to use printers to put more substantial and important information on paper. That way, we get the digital benefits of searching, organizing, mass storage in tiny space, unlimited and free mass duplication, and so on, while still being able to print multiple copies anywhere on demand in order to produce redundant hard copies with extreme archival durability (provided you do some research on archival paper and printer ink/toner). Of course, if you love using an elegant pen for the esthetics and freedom of it (okay, hard to argue with that), then do anything important on fine, archival, loose paper with a beautiful, pigmented (not dye) ink, and scan and OCR it to once again maximize its usefulness and longevity. You can bind such paper into a beautiful notebook after writing and scanning.