How to Back Up Your Mac Before It’s Too Late

I hear it every day. Someone’s device has a problem, and now they need all their data back. The trouble? “Nobody ever told me to back up,” or “I don’t know how to back up.” They’re always upset to learn that, by the time they’re talking to me, it’s usually too late. So here’s how to back up your Mac — and why you should do it today.

Sometimes we can recover the data, but not always — and data recovery can be expensive. That’s why it’s so important to back up your Mac before something goes wrong. Not every backup solution is as good as Time Machine, but any backup, even an old one, is better than nothing.

How Should You Back Up Your Mac?

There are a few common ways to keep a copy of your files. Here’s how they compare.

Time Machine: The Best Way to Back Up Your Mac

I use Time Machine myself, and it’s the best backup tool I’ve ever seen on a Mac. It’s built into macOS, so all you really need is an external hard drive that’s larger than your Mac’s storage — ideally about twice the size.

Once it’s set up, Time Machine automatically backs up everything on your Mac every hour while the drive is connected. It keeps hourly backups for the past 24 hours, daily backups for the past month and weekly backups for older months, deleting the oldest ones when the drive fills up.

The catch is that you need to remember to plug the drive in. For an iMac, Mac mini or a MacBook that doesn’t move around much, that shouldn’t be a problem — just leave the drive connected.

iCloud: Easy, but Not a Complete Mac Backup

iCloud isn’t the perfect solution for most Mac users because of how much data it uses. If you don’t have a good internet connection, or you don’t want to pay a monthly fee for extra storage (you only get 5GB free), it probably won’t work well for you.

Keep in mind that iCloud Drive syncs your files rather than keeping a separate copy — if you delete a file on one device, it’s deleted everywhere. For an iPhone or iPad, though, iCloud Backup is easy because you don’t have to think about it.

Copying Files to a USB Stick

This is what most people picture when they hear “backup.” It’s better than nothing, but it only captures your files at the moment you copy them — any changes you make afterwards aren’t saved. And if you’ve ever seen me do my laundry, you’ll know there’s always a chance a USB stick ends up in the wash or goes missing.

Any Backup Is Better Than No Backup

The best kind of backup is the one you actually use. I don’t mind whether that’s emailing files to yourself, or using OneDrive, Dropbox or iCloud. As long as you have a backup, you can avoid expensive data recovery.

How to Set Up Time Machine on Your Mac

1. Connect an external hard drive or SSD to your Mac (ideally at least twice the size of your Mac’s storage).
2. Open System Settings from the Apple menu, then go to General → Time Machine.
3. Click Add Backup Disk (or the + button) and choose your drive.
4. Turn on Encrypt Backups if you’d like the backup protected by a password — just make sure you write that password down somewhere safe.
5. Click Set Up Disk. If the drive needs to be reformatted, your Mac will warn you that anything already on it will be erased.
6. Let the first backup run. It can take several hours, so it’s a good one to start overnight. After that, Time Machine backs up automatically every hour while the drive is connected.

To restore a file later, open the folder it was in, then choose Browse Time Machine Backups from the Time Machine icon in the menu bar. You can find more detail in Apple’s Time Machine guide.

Already using Time Machine? Read when was the last time you used Time Machine? to check it’s actually working, and if you’re planning a big update, see our things to do before upgrading your Mac to macOS 27.

Need Help Backing Up Your Mac?

If you need a hand setting up your backups, drop by the Monkey Bar Help Desk at Lithgeek and we’ll be happy to show you. Normal Monkey Bar fees apply.