I store photos on different hard drives. I also always partition my drives and keep my photos off a drive that has an operating system. This way, when Windows catastrophically crashes (note "when," not "if"
), my files are usually safe because of the partition. I just backed up my photos onto another computer.
I prefer not to use CDs because they scratch so darn easily.
Redundancy is key, so the more places you have files sitting around, the better. Best way to go is partition the hard drive, keep the photos on a non-OS drive, copy the photos onto another computer's non-OS drive, and burn them to CDs/DVDs or store them externally somewhere. You can mail the CDs to a family member out of state/country if you're real paranoid. Tell them to keep it sealed in a safe place, so that if fire or flood wipes out your stuff, it's still safe and secure elsewhere.
Currently not active in aviation photography or this site. Thank you for your interest.