An average empty external costs around €100. We can buy it from any retail or online store. If you save all your important documents and files on that external in 12 months that same empty external will be worth much more than the initial price.
When we grow up we read books, go to workshops and evolve we add more ‘documents’ into our brains. We become more valuable to our clients and in our jobs. Why would anybody want to stop evolving and going beyond?