I would use es file explorer. It is awesome for browsing the folders on your phone as well as moving files to and from your internal storage. I also always use my external SD for pictures, music and videos I always go into es file explorer before I wipe internal storage to make sure I won't lose something important. Or you can use Google to back up. Google plus will backup photos as well as Drive. Although I've found the auto backup on Google plus to be easier and more convenient.
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