@jopiejans
Here’s a link to a video from the developer that shows you how to get your app key and secret key. The beginning is how to set up the plug-in then he shows you how to set up Dropbox
http://readyshoppingcart.com/wordpress-backup-plugin/
I saw the video, but it doesn’t work on my site.
After generating the two keys Authorisation never finishes.
Contact us with your WordPress details
I’ll check what’s wrong.
I sent all my credentials, mailed several times, but no respons. So I disabled the user and chose an other plugin for backup.