Generally it’s completely safe to just reinstall OS X on top of itself, as long as you have backups. I’ve had to do it a few times over the years and without ex

Generally it’s completely safe to just reinstall OS X on top of itself, as long as you have backups. I’ve had to do it a few times over the years and without exception it has booted up correctly afterwards. But if you do power user things (custom kernel extensions, disable system protect, etc.) then of course you’re at a higher risk.