Hello, I am practically fully upgrading my PC in a sense, I am upgrading my motherboard, ram, CPU, the cooling fan, and also my graphics card. My current motherboard is a MSI Z97 Gaming 5, and I am upgrading to a MSI Intel 7270, I was wondering if, first, I needed to purchase a copy of Windows 10 or should I not? Also, should I backup my SSD and HDD? Will they be wiped when I upgrade? I am fairly new to this so I have no idea what to expect.