I used to clone my OS drive for free with the MiniTool Partition Wizard! BEST cloning software you could get … and it was FREE!
Arconis True Image would not produce a bootable GPT clone anymore!!! It was driving me nuts! $59 US later for MiniTool and I have an interchangeable clone now.
There’s lots of free tools for this, but they are usually a smidge harder to use. Clonezilla would be one example (which is kind of a fancy UI for the GNU dd utility).