I use iTunes and I keep the music folder with all my music files on an external hard drive. I don't have any DRM'd tracks that I'm aware of, with one possible exception (I'm not sure about that one). Anyhow, in case that HDD goes south, I'd lose all my music, so I want to make a backup to another external hard drive. I tried to use SuperDuper (with which I've had success in the past). Problem is, the copying operation hangs up at some point and makes no further progress. I tried several times - once it hung up at 3GB, another at 25GB etc. The amount of files is 300GB. I used Disk Utility to completely erase the target HDD, and tried again, but it always hangs up. I also used the "repair disk" function, but it showed no repair was necessary. So then I gave up on SuperDuper, and tried to just do straight "copy" from the original HDD to "paste" on the target HDD. At that point, a dialogue popped up: "The operation could not be completed because you do not have the necessary privileges for some items". I checked read and write permissions on both disks (using "Get Info"), and I do have both. So what gives? And how can I make a backup copy of my music external hard drive? TIA!