1) Write that the backup process is stated, not only to take a cup of coffe, people want to see something movingand quickly, instead i needed to wait not few seconds firs to read that the first 200+ files was uploaded.
2) Write please on the backingg up page if it's possible to close the browser or if we have to let the browse opened on that page.
http://wordpress.org/extend/plugins/wordpress-backup-to-dropbox/