External HDD's are your best bet. DVD and CDR media are turning out to not be the long term storage solution we were all looking for. It turns out the photo-reactive dyes used in them are breaking down much sooner than expected.

HDD's are much faster and easier to use as well as more stable over the long haul so for long term storage I would choose a Hard drive. As a saftey measure you might want to also back up to DVD.

Backup Software?

Thanks for the reply Big D.
So in order to back up to DVD, what software is capable of backing up to a series of disks incrementally?
Say my project is 9 gigs.

Joshua

I wouldn't worry about backing up to DVD incrementally. I would suggest backing up incrementally to an HDD and then backing that up to DVD whenever you have enougn data to fill a DVD.

The simpliest solution for incremental backups to HDD are the Maxtor One Touch drives like this.

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They are USB 2.0 and some are 1394 also. To backup your data all you do is press the button on the drive. You do a full backup the first time and every time after that it's incremental. Couldn't be easier. When you have backed up enough data to fill a DVD you can burn one.

AIT if you are serious about long-term storage and have the $$$