So the Google made easy the problem of losing your hard disk. Now if your computer gets some bad bug in it which crashes the whole hard disk of yours containing your all time Favorite and precious music collection, well no problem then! Google Music got the solution now. Now with the Google Music Manager you can download your entire library even your purchased song too. So if by any chance your hard disk gets some trouble with it, with one click of download you can restore all your collection.
Moreover you can now select and then copy multiple tracks direct to your drive. There is only some restriction over purchased items which are restricted to two downloads each through the web interface.
