Google announced that .yu domain names will stop working from Septemeber 30.
Therefore Google started to gave some tips ,helping people to understand how they can keep their content appropriately.
The first step is to check you backlinks: "Since it won't be possible to set up a redirection from the old .yu domain to your new one, all links pointing to .yu domains will lead to dead ends. This means that it will be increasingly difficult for search engines to retrieve your new content."
Moving on to next step,Google informs us we should check our internal links too,if we are planning to move our content in bulk from the old site to the new site.
In the end they advised everybody to start moving their site to an other domain as quickly as they can .