What a Mac that never sleeps does all day — five settings to check
Unlike a laptop, a desktop Mac sits on the network around the clock. Some settings only become a problem on a machine that stays awake.
More houses now have a computer that is simply always on. Running a media server, backing up photos, or just left on because switching it off is a nuisance.
Unlike a laptop, a machine like that stays on the network all day, and does most of its work when nobody is watching. Which turns settings you never had to think about on a laptop into something worth checking.
If you have been through your iPhone’s settings the names here will look familiar — but a Mac has items of its own.
1. What “doesn’t sleep” actually means
System Settings → Lock Screen / Energy
A desktop Mac turns the display off by default and leaves the machine awake. During those hours it runs backups, syncs, checks for updates, and lets every installed app do its background talking.
None of that is bad. The point is that “it does nothing while I’m not using it” is the wrong mental model, which is why the items below are worth one pass.
2. Analytics and advertising — same place as the phone
System Settings → Privacy & Security
Scroll down and there are two entries.
- Analytics & Improvements — turn off “Share Mac Analytics”
- Apple Advertising — turn off “Personalised Ads”
Turning these off on your iPhone does not apply them here. Each device is separate, even on the same Apple account.
3. Check what runs in the background
System Settings → General → Login Items & Extensions
This holds the list of what starts when you log in and what is allowed to run in the background. On an always-on machine that list matters because everything in it keeps running while you are not there.
If a name means nothing to you, search it. It is common to find leftovers from an app you installed and deleted long ago.
4. Screen sharing and remote access
System Settings → General → Sharing
This is the place that only becomes genuinely risky on a machine left on. The list holds things like:
- Screen Sharing
- File Sharing
- Remote Login
- Remote Management
On a laptop these come and go with the lid. On a machine that runs 24 hours, they are open for 24 hours. Switch off anything you don’t use.
If you have File Sharing on, it is worth checking which folders are shared and with what permissions. Combine that with UPnP or remote management left on at the router and it may be reachable from outside the house.
5. Which network you put it on
This one is not a Mac setting; it is a question about how your house is arranged.
If the always-on Mac holds your photos and documents, it belongs on the main network, not the guest network. The smart devices are the ones that go across. Get that the wrong way round and your most important machine ends up standing next to your flimsiest one.
What becomes less convenient
- With sharing off, other devices can’t reach this Mac’s screen or files. If you were using that, switch back on only what you need
- Tidying login items means some apps won’t start on their own. Launching them usually prompts to re-register
- Turning off analytics and advertising costs nothing at all
In short
| Question | Answer |
|---|---|
| I turned it off on my iPhone — is the Mac done | No. Every device is separate |
| What’s different about always-on | Background traffic and sharing are open around the clock |
| First thing to check | Sharing — switch off what you don’t use |
| Then what | Login items and background list, for names you don’t recognise |
| Analytics and ads | Turn them off. Nothing gets worse |
| Which network | Main. The guest network is for smart devices |
A laptop is finished when you close the lid. On a machine left on, that state is the default. One pass through and you rarely need to look again.