Long Path Eraser (LPE) is a free tool that allows deleting files and folders with too long paths, that you cannot delete manually.
Practically, that folder cannot be deleted anymore. Copying and synchronizing files and folders with Iperius Backup or any other backup software, sometimes it might happen the destination path of the files becomes too long to be handled by Windows (in fact, the maximum path length allowed by Windows Explorer is 255/260 characters). When a folder contains files with a path that exceeds the maximum path allowed by Windows, there could be errors in copying or deleting those files.