In terms of where to get started... first, I'd download your archives!

Your blog posts are definitely saved and available for a free download:
http://karen-1416.xanga.com/

You can download them by signing in here:
http://xanga.com/wp-login.php

Once you have a copy of your blog posts on your own computer, you can do one of two things:

1. Upload your archives to another site that's compatible with your blog archives.

WordPress.com is one such free site...

2. Upgrade your account to Xanga 2.0, and stay on Xanga.

You can do that here, if you'd like:
https://xanga.crowdhoster.com/relaunch-xanga

Let us know if you have any questions!