Amazon now has a web service called Glacier, that is a cheap back up and cloud storage solution. Let's see how it compares and if it is right for you!
How it works: They offer space called a "vault" that you can store your data for a small amount of time or for decades. The data is "archived", and each "archive" is assigned a unique archive ID that is used to retrieve the data. You can store any kind of data in any kind of format.
Pricing: Amazon boasts that it charges $0.01 GB per month and you pay what you use only. There are no set up fees. To obtain your datat it costs $0.05 per 1,000 requests. It is meant for data that is infrequently accessed and long lived. So maybe your pictures? The volume of storage billed in a month is a based on the average storage used throughout the month.
Check it out yourself and if there is data that you need to store and not reallyl access then this may be right for you!