Prepare for and install a macOS update
Mac with a current backup
When to use this: Prepare for and install a macOS update — use these initial checks when this matches your situation. On a work or school device, follow your organization's policies and stop if a setting is managed.
- Confirm your important files are backed up and that you can access the backup.
- Connect power and allow time when you will not need the Mac.
- Open System Settings, General, Software Update.
- Review the offered update and follow the prompts if your organization permits it.
- Let installation finish before disconnecting power.
Check the result: The Mac restarts normally and Software Update shows its current status.
Stop and get help when needed: For business-critical apps or a managed Mac, confirm compatibility and update policy with IT first.
Need hands-on help?: Request DefenderTech support for individualized investigation or changes. We will explain the scope and estimate and ask for authorization before paid work begins. Do not include passwords, recovery keys or verification codes in your request.
Official references: - Apple guidance: https://support.apple.com/en-gb/108382
Updated 2026-09-30