found something about leaving tumblr & saving/ export blog from tumblr to wherever:

Export your blog You can export all of the content you’ve created for your blog, and we’ll package it up into a convenient ZIP file for you to download.
To start the process, go to your account settings on the web:...
You can export all of the content you’ve created for your blog, and we’ll package it up into a convenient ZIP file for you to download. To start the process, go to your account settings on the web:...