With our life’s constantly becoming more and more depended on electronic devices we have to device ways to keep everything in sync. Nowadays we have smartphone’s, tablets, laptops, netbooks, media centers and all of this devices keep copies of out data. Our word documents, pictures, expense estimations etc.
Up until very recently, and some of us still do, we move around with usb sticks portable usb hard drives and basically a copy of our digital life.