I plugged in a USB drive and got an annoying prompt about backing it up. I've never used the Dropbox Backup feature and don't want to, especially not for a drive I'm using itself as a backup.
I turned off autoplay completely for now in my Windows settings, but I shouldn't have to do that in order not to use Dropbox Backup. The help page for this is out of date and describes a setting that doesn't exist. There appears to be no way whatsoever to disable backups.
So, short of nuking Dropbox completely and moving on to something else for cloud storage, how do I disable the annoying backup feature?