I've been considering how to improve the backups of my personal digital library such as photos, music, files, and other data after reading a story that's been widely circulated since last week. An IBM researcher estimates the lifespan of CD-R discs to be a mere 2-5 years, depending on factors such as heat, humidity, and light.

Storage expert warns of short life span for burned CDs

I'm considering options such as a 300 GB, 600 GB, or 1 TB Maxtor Hard Drive, maybe two of them in fact. To prevent bit rot I could transfer all the data from one megadrive to the other every couple of years, back and forth to write the data fresh. Of course, just like genetic mutations, with frequent copying some variation is introduced due to minor copy errors.