Backing Up Your Backup Drive - The New York Times
Q. I keep my photos, videos and other multimedia files stored on an external USB drive to save space on my computer’s main hard drive, and I also back up vital folders there. But how do I back up the external drive in case it goes south?
A. You can create multiple backups of your important data in several ways, including on multiple external drives, to a home network server or to an online cloud-storage locker.