Since delicious's new owners are going to be making some changes in the bookmarks, it is a good idea to take a backup of your bookmarks.

The quickest is simplest way is to use the delicous's API. Just log into delicous the open the page:

https://api.del.icio.us/v1/posts/all

This API link provides you all your bookmarks in XML format. You can save the link and process the XML file however you like. Easy, isn't it?