Team Win Recovery Project (TWRP) v3.0 is now available for the Exynos 8890-powered Galaxy S7 and Galaxy S7 Edge. Well, if you don't what TWRP is already, it's a custom recovery with which you can do a whole lot of things which your stock recovery cannot do. Like flashing custom roms, making backups of your current device firmware which can be restored when needed, flashing custom kernels, etc.
Follow the links provided below to learn how to install this recovery on your device.
Samsung Galaxy S7 - Click here
Samsung Galaxy S7 Edge - Click here