Depending on the size of your collection, it might be a lot cheaper (and easier) to just back everything up to an additional hard drive, and keep it off site.
I do both hdd and dvd. too paranoid
Why are you paranoid? What's to be paranoid over with redundant harddrive storage? The only thing to worry about is NON-REDUNDANT harddrive data backup.
Does your typical workplace backup critical-to-commercial success data to DVD or tape?
No! They back up onto redundant hard drives with redundant power supplies in redundant locations.
In my mind, if work doesn't do it, and work info is FAR more important than my music masters, then why should I feel a greater sense of urgency or heightended sense of paranoia that I need to backup to DVD _AND_ harddrive.
Bottom line is that when done properly, hard drives are far more reliable and WAY cheaper than backing up to DVD. I bought expensive CDRs and DVDs in the early days and I'm having tons of failures of my old DVD and CDR media. (Remember what they say...that DVDs and CDRs are only good for 5 years...BELIEVE IT!!!)
So, I just don't agree that harddrive storage is not reliable. It's unreliable if you only have your data on one hard drive. But if you back up hard drive data onto another hard drive, you're VERY reliable. (If a harddrive fails, replace it but do it quickly so you can make sure and make all your data redundant again.)
At $100 per TB, that's SCADS cheaper than DVD backup.