I noticed the website had been migrated when I tried to link someone an old blog post and the archive URL 404'd.
Luckily, everything is preserved in git---both posts and binary assets. The only assets that are not in git were media files, which were served from the CSC mirror.
Please consider migrating the blog to the new website. It should be relatively straightforward to either copy a static generated archive to be served simultaneously with the main site, or with a bit more effort, migrate posts to the new theme.