Does updating mac os delete everything
Back Up Your Current Installation of mac OS Now The first thing you should do is determine if your Mac is compatible with High Sierra.
It turns out the new file system has a high preference (no pun) for SSD based Macs.
In addition to the new i OS version 11, Apple also released its latest revision of its desktop operating system, mac OS High Sierra.
High Sierra, version 10.13 sounds more like a minor revision of the previous release, Sierra 10.12.
Having a bootable copy of mac OS Sierra on hand can help.In the meantime, you can wait it out and continue with the older version for time being.I’ve seen users happily use Macs with versions as old as 10.6; so, don’t feel too bad being a version or two behind. If so, tell us what you are excited about in the new version.Update All Your Apps Apps will need to be modified to support High Sierra’s file system, especially disk tools.
But for other apps like Microsoft Office and Adobe Creative Cloud, make sure you have updated versions installed so you are not in a chicken or the egg situation after reaching the desktop.
There is no easy way to go back because earlier file systems are unrecognized by APFS.