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As described in this thread, the new version of dropbox backup is great but has a major downside: files stored via backups can no longer be accessed within the dropbox app! Quoting @mbriney from ...
Hannah I just want to point out that one of the features of Dropbox Backup that you advertise on your website is that it's possible to access files from the mobile app. That is to say, we shouldn't have to vote on whether this feature should exist because you already claim it does. It turns out to be misleading advertising 😞
"View backups whenever, wherever. Just as you’d expect from Dropbox, you can easily get to your backed-up files anytime, anywhere – from your computer, through our mobile app or on the web." https://www.dropbox.com/en_GB/backup