kryu2

Thank you for your quick replay.
And sorry for my late response.

I write a code below, and works fine!
Thanks!!

function updraftplus_filename_func() {
	return str_replace(array('.','/'),'_', str_replace(array('http://','https;//'),'', substr(home_url(), 0, 32)));
}
add_filter( 'updraftplus_blog_name', 'updraftplus_filename_func', 10);