Thanks for the plug Peter..
In terms of backing up or archiving your content you need to set down what that data maybe needed for in the coming weeks, months, years.
If you will rarely (if ever) need to access that content then some form of LTO solution may be an option. Saying that, data tape has its own problems and limitations which I will not trawl through here but you may be interested in the following posts which explain the ups and downs of archiving/backup to various platforms, from USB disk to the cloud:
Building a data Archive
http://www.matrixstore.net/2008/02/11/building-a-data-archive/
TCO considerations (Tape vs Disk)
http://www.matrixstore.net/2008/03/03/problems-with-total-cost-of-ownership...
Disk Efficiency
http://www.matrixstore.net/2008/11/12/towards-100-times-better-energy-effic...
If you want to get quick access to your assets with little or no management effort then you could take a look at clustered storage solutions, one of which is MatrixStore (our product). It takes the priesthood out of managing large volumes of data but more importantly give you access to your content when you need it.
Please do contact me directly if you would like to know more..
Thanks
Nick
http://www.object-matrix.com