How to Update macOS Safely: Backup, Compatibility and Space

macOS updates bring security fixes, new features and bug fixes, so keeping your MacBook current is important. But a rushed upgrade can leave you with incompatible apps, a full drive or, in rare cases, a Mac that won't finish starting up. Learning how to update macOS safely takes only a few extra minutes. Here's the checklist we recommend before every update.

Step 1: Back up your MacBook first

Most updates go smoothly, but the one that doesn't is the one you'll remember. Before any update, especially a major version upgrade, make a full backup.

1. Connect an external drive and run a Time Machine backup.
2. Make sure important files are also in iCloud Drive or another cloud service if you use one.
3. Check that the backup actually finished before you continue.

Our guide on backing up a MacBook with Time Machine and iCloud covers the full process.

Step 2: Check compatibility

• Your Mac: Apple publishes a list of supported models for each macOS version. If your MacBook isn't listed, Software Update won't offer that version.
• Your apps: Check with the makers of apps you depend on for work, such as accounting, design or audio software, plus printer and scanner drivers. Some developers need a little time to update after a new macOS release.
• Your timing: If your MacBook is essential for work, there's no harm in waiting a few weeks after a major release for early bug-fix updates. Security updates for your current version are worth installing promptly.

Step 3: Free up storage space

Major macOS upgrades need a lot of free space to download and install, and a nearly full drive is one of the most common reasons updates fail or stall. Check your space in System Settings > General > Storage (or Apple menu > About This Mac > Storage on older versions). If space is tight, see our guide on how to free up storage space on a MacBook.

Step 4: Run the update

1. Plug in the charger and keep it connected throughout.
2. Connect to reliable Wi-Fi, ideally at home or work rather than public Wi-Fi.
3. Open Software Update: on macOS Ventura and later, go to Apple menu > System Settings > General > Software Update. On older versions, go to Apple menu > System Preferences > Software Update.
4. Choose the update and click Update Now or Upgrade Now, then enter your password.
5. Be patient. The Mac may restart several times and show a progress bar or a black screen for a while. Don't close the lid or hold the power button unless it has clearly been stuck for a very long time.

Step 5: After the update

• Open your most important apps and confirm they work.
• Check for app updates in the App Store and from other developers.
• Expect the Mac to feel a bit busy for a day or so while it re-indexes files for Spotlight and Photos.
• Re-check privacy and security permissions if apps ask for them again.

Need help with a macOS upgrade in Ottawa?

If an update stalled, your Mac won't start after upgrading, or you'd rather have a technician handle a clean macOS reinstallation, Fix Revolution can help. We pick up and drop off your MacBook at your home or office anywhere in Ottawa and Gatineau, and most jobs are done within 1–2 business days. As with any service, please back up beforehand when possible. For macOS upgrade help or MacBook repair in Ottawa, get a free quote or call 613-265-4349.

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