Hey friends, I just bought a G-Drive for my iMac, just plugged it in.. it shows up on my desktop, woohoo! I have some basic questions. I bought this to use as incase my iMac's harddrive fails. So basically, i'm going to copy my music & photos onto the external harddrive and then i'm done. i'll update once a month maybe. So do I need to constantly leave the harddrive on? Do I need to leave it plugged in? Any other tips i should know? Thanks!