If the site is still active, you can archive it yourself using tools like wget if the blog is still plays friendly with old school tools. Edit to add, if you

If the site is still active, you can archive it yourself using tools like wget if the blog is still plays friendly with old school tools. Edit to add, if you need to find pages that have been removed, thus the only place might been once cached within the likes of google - about the only place left is asking the admin or author(s) of the blog.