yes say so have tracker X and tracker Y

to upload files from to tracker Y that you downloaded to tracker X initially all you do is create a torrent on the seedbox with your announce url for tracker Y and then you can seed both those torrents from the seedbox, have a look at my seedstuff.ca review, they have seedboxes with rutorrent(its basically like utorrent) but its a web-interface which means you can control your seedbox from your browser and add/delete/create torrents all from there. Very noob friendly.