A backup solution that I find to be much more practical is a pocket-sized USB 2.0 disk drive such as the ones sold by DataStor. (There are many vendors.) They use the same drives that are used in laptops, are quite rugged, and as I said, literally fit in your shirt pocket. Or in the safe-deposit box that's at the local bank which sits next door to that great coffee-shop on your way to work.
Amanda is great, and available, for doing reliable backups of your information. (Just having the presence of a reliable on-disk backup, and several generations of the same file at your fingertips, is a godsend unto itself.) But we never actually transfer anything to CD-ROM nor to tape. Instead they are transferred to a rotating set of pocket-drives which are stored either in a firebox in the office or in the bank's vault. You just have to develop a discipline about actually doing that, and actually recording that you did it.