Storing Digital Photos

My collection of pictures taken with digital cameras, which dates back to 1996, has recently got large enough to become an issue in its own right when it comes to storage and backups. I decided to investigate further, and used JDiskReport to create this graph:

This covers the entire 12GB of pictures, and shows that the majority of the data is contained within the last year. The cause is obviously higher resolution images, more memory on the camera and an increasing inclusion of video as well as still images. This means I can expect to be adding to this data at a rate of at least 11GB per year from now on, even if I only continue at the current rate. I seem to be doing ok with not losing it for the first decade, but I need to get a bulletproof backup system in place for this before it gets out of control.