To be honest, although it may lack one or two features, Paragon is probably the most user friendly. It has a simple user interface, with a fairly basic wizard with which to set up and schedule backups. If you don't need advanced features, it does what it says on the tin. The issue I had with it was that there is no system tray icon to tell you when it is performing a backup, so it is quite easy to forget and power off your PC halfway through a backup, which means that the backup would obviously fail. But if you have scheduled your backups and you know when they're taking place, that shouldn't really be a problem.