I have been digging in Google for quite sometime and most of the informations are for old platform
Here it is for new platform :
(1) click setting
(2) click others
(3) click on the export blog (ITS AT the TOP, ok, JUST BELOW YOUR BLOG TITLE in BLUE TEXT)
(4) click download (as written there your blog will still be there unless you delete it)
Maybe just watch this short video on importing and exporting your blog :
Hope it really help as most of the authors told you to look for the blog tools, in which you might missed it.
Kindly tweest or share this info as there is a dateline for hosting site to migrate endling today or tomorrow 18th April 2012, please drop me comment, thanks.