USB stick in your pocket sounds nice but what happens when you drop your keys and it cracks or you get caught in a rain storm and it gets soaked?
Someone else made it similar comment, so I clarified the phrasing of my original post. The main backup of allll my decades of digital junk is independent and happens elsewhere.
Even if I had a USB-stick of magical capacity and reliability, I wouldn't want to have to remember to connect and disconnect it constantly.
Then the copies that exist on the USB are fried but the original that live at home on your desktop/laptop are fine?