According to the definition of the Yandex search engine, partial or total copying of a resource is a mirror of a site. But why make a copy if there is a completely unique portal? Believe me, there are reasons why the creation of a website mirror is so necessary.
The last humanist of the gallant century, Alexei Isaev, is a famous candidate of historical sciences, the author of many books about the Second World War. In his studies, he relies on foreign and Soviet archives, refuting many myths about that war.