I have to admit I have tried a couple of external methods. I do back up across my own network, but have tried Just Cloud, who were an absolute nightmare, it was so cumbersome and difficult to use. I have recently given Microsoft Sky Drive a go and have been very impressed. It runs in the background and updates files in realtime. The original files remain on your PC and are backed up to the cloud, It also allows me to view and edit my files on my iphone and ipad and then updates them on my PC. Cost is also very good you get 8GB free, Then I think it was about £30 a year for an extra 100GB. And you can literally back up anything. Support has been very good...and if the CIA want to have a browse through my files they are welcome