Your music files are computer files like any other computer file. Move them as you would any other computer file. The time it takes depends on how fast your hard drives are spec'd, your hard drive controller and your computer's processor. 30Gb shouldn't take more than 20 minutes.
Transfer music from PC to external hard drive
I started ripping songs to my hard drive and it is only a 30GB drive. I am going to tranfer my music to an external hard drive. Is it as easy as drop and drag from windows explorer to the external hard drive. Is it a relatively quick process. I also want to back up the external hard drive to another one. I want to clear out my PC hard drive. Does the drop and drag process take files off my original hard drive. All music files are windows media player in the lossless format.