I'm using a Japanse title on my WordPress site.
UpdraftPlus plugin use a logic for creating a zip filename.
$blog_name = preg_replace('/[^A-Za-z0-9_]/','', str_replace(' ','_', substr(get_bloginfo(), 0, 32)));
get_bloginfo() returns blog name, then all blog name strings are delete.
Could you add option to use URL parameter?
Like get_bloginfo('url')