Ok I understand I can reinstall Mac OS from the Command + R Menu and the OS is reinstalled without touching (we hope) my files unless I erase the disk first. However, what if I just choose to restore a Time Machine Backup? Is any disk repair or OS repair performed or is it just a clone of the last backup? Any corruption in the Time Machine Backup would not be repaired but rather put back on its corrupt state? Is the recommended Troubleshooting Procedure to always reinstall MacOS and then restore your TimeMachine Backup?