The steps below are for Catalina but it should be the same for other versions of macOS.
- Ensure you have a Time Machine backup and have iCloud configured to backup important app settings, e.g. Documents, Device Settings, Mail, Contacts, Keychain, etc. and everything is synchronised to the iCloud server.
- Make a list of installed Applications for later use as follows:
- In Finder open Applications folder and press Command+A to select all apps, then press Command+C
- In TextEdit,