請問長期備份用什麽好，移動硬盤行嗎？

need to backup my personal data, movies, pictures, etc. what is the best way?

one way is to copy them on DVD. however, it is not convenient and takes time to copy lots of DVDs. and DVD looks not very reliable.

How about mini external hard drive?

各位高手能不能給些建議。 謝謝。