All good Macs must come to an end, and one day, unless you hoard them away, go to someone else. That someone else could be a close relative, a purchaser, or the fate of recycling. The last thing that you want to do is simply shut down one day and send your Mac away, even if it is just for scrapping.
Before going any further, ensure that you have a full backup, and preferably another complete copy of your internal storage. When you’ve made your farewells to the Mac that has seen you through the last few years, run one last backup to Time Machine, then turn Time Machine off.
I like then to make a full clone of the boot volume using Carbon Copy Cloner or SuperDuper. If in the next few weeks I discover that something important is missing from my new Mac, I can then go straight to that clone and rescue it. I still have the option of accessing its Time Machine backups too.
Deauthorise third-party licences
Next, I work through all products which are licensed by serial numbers and authorisation systems, and ensure that this old Mac is no longer authorised for them. In the days of Adobe CS, this was very important, or you could end up wrestling with Adobe Support trying to get your licence transferred.
Most schemes are much more flexible now, and might require you to log out of your account on the old Mac instead. Check for each of those apps what you need to do, and get it done next.
iTunes – deauthorise
Having dealt with all the third-party products, turn now to Apple’s. Open iTunes, and in its Account menu open Authorisations and De-authorise This Computer. You’ll then have to enter your Apple ID password to complete that, and the process does take a few moments to complete.
If you can’t do this, or forget, you can later go in and manage your account, but this is much simpler done now if you can.
iCloud – sign out
Next, open the iCloud pane in System Preferences and sign out of iCloud. In theory, this step isn’t essential, but in the remote chance that someone tries to connect that old Mac with your iCloud account, this is an important barrier to them.
Messages/iMessage – sign out
Open the Messages app, open its preferences, select the iMessage tool at the top, and click on the Sign Out button to ensure that Mac doesn’t get any more pushed messages for you.
If your Mac is going on to someone who will use it, you’ll probably be passing on its Bluetooth input devices, such as wireless mouse, trackpad and keyboard. In that case, you don’t need to do anything with them now. (But remember to turn them off when you finally shut the Mac down.)
If you’re going to keep any of those, open the Bluetooth pane and unpair them from there. You’ll then have to connect input devices using their charging cable, so that they work over USB, until your Mac is finally shut down.
If you have any other Bluetooth peripherals which you’re keeping, unpair those too.
Sanitise and prepare internal storage
You should now work through preparing your internal storage, sanitising it as necessary, as I have advised in this article.
The concluding steps in this process are common to most if not all: restart in Recovery mode (Command-R with a wired keyboard) or from an external bootable drive. Open Disk Utility, select the internal disk, and click on the Erase tool. Don’t use Partition, which currently fails to reformat APFS volumes.
If you’re handing your Mac on to another user, it’s good form to set it up as if it were new, by installing macOS ready for them. To do that, quit Disk Utility and in the macOS Utilities window select Reinstall macOS. You’ll need a good internet connection, as it will almost certainly download a fresh copy, although if you’ve started up from a bootable installer you should be spared that.
Keep a watch on the installation as it progresses. When it reaches the Welcome splash screen, press Command-Q or press and hold the Power button to shut the Mac down. When its new owner starts it up, it will then present them with that screen so that they can configure the Mac as if it was new. Then let your Mac cool down properly, and box it up in its original packaging ready to pass on.
If your Mac is going for recycling, you obviously don’t want to mess around reinstalling macOS. Shut it down, let it cool, and then work out whether you can physically destroy its internal storage. If you can’t, then provided that you have sanitised it properly, it shouldn’t present any risk.
If you can extract any hard disk or SSD without too much trouble, a heavy hammer and sharp metal objects like thick nails or punches are ideal for penetrating the case of disks and smashing their contents too. Think of all the hassle that you have had with that Mac, and now have one last chance to express your feelings physically. But be very careful not to injure yourself: wear protective glasses and suitable gloves.
If your Mac’s storage has contained very sensitive data, then you should really send its storage (or a whole laptop) off for secure disposal, but that is costly.
iOS product listing
Once you know that your Mac is gone for good, if you have an iOS device you should remove that Mac from the list of products which you own. Open Settings, and tap your name at the top. In a moment, it should list all your current Apple devices. Locate that old Mac in its list, check carefully that it’s the correct one, and make a note of its serial number in case you ever need that. Then tap the device and remove it.
All you have left now are the memories.