One of the frustrating things about WordPress is that developing in one environment and launching in another is a hassle. There are many reasons why wordpress uses absolute urls in everything it does, and many, many heated discussions about why it shouldn't (or should!) be that way, but all that doesn't make moving the site to a new location very easy. However there is an easy way to back up and restore a WordPress site.
Akeeba Backup for Wordpress is the greatest migration solution currently available for WordPress. Not only is it a fantastic backup tool, with multiple offsite backup capabilities such as Amazon S3 or Dropbox, and allows for the ultimate in automated backups through cron jobs, alternate cron jobs, and other supported methods, but it will also update the URLs in all of the content, custom fields, custom post types, and serialized data (widgets) without corrupting or losing any settings. It's a marvelous advance in site migration.