Macrium Reflect is truly free software for cloning a Windows 10 system drive. Requires registration to download and run the software, but doesn’t appear to cost anything. Had to run through a few utilities that straight up lied about being free before finding Macrium Reflect. So I wanted to give the software props for not just being a free disk cloning utility, but a great one that’s truly free. (I’m writing this post on the machine that’s using the newly cloned disk.)
PC World seems to agree.