Hi pixelmixture, you delete all files of your site using FTP program (filezilla). After that you can transfer (with filezilla) the entire site that you have backup in dropbox. For the DataBase you have to delete all tables (not the DB) and “import” the .sql file with phpmyadmin platform from your web-hosting. The .sql file is in your dropbox backup “/wpb2d/yoursite/wp-content/backups/”.
Sorry for my bad English ??
Have a nice day, Manuel