So I will be upgrading my current Motherboard and CPU. They are the MSI a88x g45 gaming and amd a6 6400k. The video card is the msi rx 480 4gb. And Ill also be upgrading ram from ddr3 to ddr4 (8gbs for now), will upgrade later to 16gb. The new processor that ill be buying is the intel i5 6500 and the motherboard is an asus h170 pro gaming. My question is if i need to format my hd. Only important things i need saved are family photos and videos. Do i need to back up my copy of windows 7 or should i just buy it again since its pretty dirt cheap for Windows 7 Premium. So should i just put all photos and videos in external harddrive, boot computer off and follow new mobo instructions to install ? Any help is appreciated