Free Video Tutorial: macOS Clean Install - Apple Mac, iPad & iPhone Tutorials from ScreenCastsOnline

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Tutorial Description

There are many good reasons you might consider doing a clean install on your Mac. Perhaps it has gotten sluggish over the years, you may have had a hard drive replaced which necessitates the process, or you'd like to have as close to a stock operating system as possible before installing the next major release of macOS.

But performing a clean install (some call it a "nuke and pave") may seem like a daunting task, one you may be reluctant to take on. In this week's show, Allison talks about all the reasons why you might want to do it, suggests some strategies to attacking the task, and then shows the process in action. The full tutorial covers:

  • Introduction & Why?
  • When?
  • How Long Will It Take?
  • Organize Apps & Tasks with a Mind Map
  • Show Date Last Opened in Finder
  • Adding Apps to Mind Map
  • Finding Mac App Store Apps
  • Setapp Applications
  • Mind Mapping Tasks
  • Color Code Mind Map
  • Track New OS Compatibility
  • Create a Bootable Backup
  • Clone Backup Software
  • SuperDuper! Demo
  • About the T2 Chip
  • Erase Your Drive
  • Welcome Screen After Reinstall
  • Migrating Your Data Back
  • Reinstall Applications
  • Save Your Backup in Cold Storage

Show Links:

SuperDuper! - Shirt-Pocket

Carbon Copy Cloner - Bombich

How to see which installed apps are from the Mac App Store using the Terminal - OSXDaily

Terminal command from the osxdaily article above: find /Applications -path '*Contents/_MASReceipt/receipt' -maxdepth 4 -print |\sed '; s#/Applications/##'

How to erase a disk for Mac - Apple Support

How to reinstall macOS from macOS Recovery - Apple Support

How to access Startup Security Utility - Apple Support

Video Tutorial Comments

(2 comments posted)

Don J J Carroll

Saturday, January 09, 2021, 12:31 p.m.

Wow, what an excellent tutorial. I have often heard or read about people doing a clean install but this tutorial by Allison explains it fully. I must admit I am "scared" to do a clean install but I probably should since my iMac 27 is a 2015 build model and to date I just updated the Mac OS by the standard "non-clean install" way. Not being a computer nerd, I will watch this tutorial again and then decide whether to do a clean install or just move to the next Mac OS version. I am currently on High Sierra 10.13 and plan to move to Catalina 10.15 and I know I have non 64 bit apps on my system that require attention. Allison's explanation and use of iThoughtsX mind map is a great idea and I think I will use iThoughtsX to plan my Mac OS upgrade move. Allison is an awesome instructor, great voice, great communication skills and provides suggestions as to what other apps one can use to accomplish a task, ex. her mentioning of cloning a hard drive using Superduper or Carbon Copy Cloner. I have found that if I ever wanted to know details about a specific software or how to do specific things like clean install, I always know I can count on Don McAllister and his Screencastonline team, a super resource site for Mac aficionados.


Allison Sheridan

You made my day, Don! Good luck, I hope you take the plunge. If you have any questions, feel free to reach out to me at [email protected] and I’ll try to help.

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