I am using time machine on my new iMac for a general backup. On my old windows PC I used to manually copy music photos and videos to an external NAS drive weekly (or whenever i remembered) as a back up. Also once on there I could watch the videos and view the photos on my iPad. Now I am trying to do things properly and am looking for the best software to do this for me. Something that will save me the hassle of manually dragging folders across to an external drive. Any good recommendations?