Whenever I plug in a USB thumb drive to my PC, Dropbox asks me if I want to back it up. I NEVER want to back it up. The instructions I found said to go to my settings and select the BACKUP tab, which I so far have been unable to find. The Settings tabs consist of General, Plan, Security, Notifications (which does not include this option), Connected Apps, Default Apps, and Branding. I am a Dropbox Basic customer and have been using Dropbox for many years, and I did not start having this problem until recently. I have spent hours trying to solve this myself and I finally gave up. Please help!