Cannot Back up My Macbook due to leftover traces

[DuLac]

When I try to backup my macbook I get an error message saying something about a torrent file. I cant find the file. Its something about 'vampiros habana", when I search my mac for 'vampiros' all I get is a link to a webpage, demonoid. I dont know anything about this, think it must have been my ex. How can I remove it? I will attach a screen shot