Windows comes with commands to do that (command prompt = dism /online /export-driver /destination:"path of folder" : powershell = Export-WindowsDriver -online -destination "path of folder")
Having said that I'd question the need to backup drivers rather than simply saving a copy of the drivers you've downloaded due to a lot of Windows drivers coming with their own applications for changing settings, something a simple backup of drivers will miss as it does what's on the tin. It would backup the drivers and drivers only, it would not include any of the software that gets installed along with those drivers.