Welcome and thank you for using Just Answer.
The "Click Free" unit is just that. By just plugging it in it automatically backs up all of your files on your computer. This may take some time depending on how much information you have. The upside to this unit is that you do not need to install any software to use it or learn how to use the software as there is none.
Based on reviews it appears that the biggest complaint has been that it comes with no manual only a trouble shooting guide.
Based on my experience something that only requires you plug it into your USB port doesn't require a manual per se.
Is there something more specific you're looking for? Please feel free to ask!