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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 ...
This is really basic functionality so that anything backed up is easily accessible on a moment's notice without any additional planning or preparation. It is infeasible/insecure to have to log in to the website on my mobile device.
Additionally, competing cloud backup services already provide this functionality and from experience it is hugely useful to have easy access to one's backup on the go.