SuperDuper or CarbonCopyCloner.
The SD interface is a little easier to use, but CCC offers the user more options.
You didn't tell us WHICH Mac you have, but if it's Apple Silicon, SD can create a bootable backup, pretty much like it used to. Although the overall "usefulness" of having a cloned backup isn't what it used to be.
CCC can do this as well, but again, SD makes the process easier.