How to Back Up Your Mac Using iCloud

What iCloud backup actually does

iCloud backup saves copies of your Mac's files, settings, and data to Apple's servers so you can recover them if your computer breaks, gets stolen, or stops working. It is not the same as syncing — backup creates a snapshot at a moment in time, while syncing keeps the same files updated across all your devices. When you turn on iCloud backup, your Mac uploads a copy of what you have to Apple's storage, and you can restore from that copy later.

The backup includes your system settings, installed applications, documents, photos, and email accounts — essentially everything except files you have excluded. It does not back up external hard drives, and it does not back up files stored in other cloud services like Google Drive or Dropbox (those services handle their own backups). iCloud gives you 5 gigabytes of free storage, which is usually enough for settings and documents but not for a full photo library or video collection.

Key Takeaways

iCloud backup stores copies of your Mac on Apple's servers and can restore your entire computer if something goes wrong.
You need an Apple ID, enough iCloud storage space, and a Wi-Fi connection to set up and run backups.
Backups happen automatically once per day when your Mac is plugged in, locked, and connected to Wi-Fi — you do not have to do anything after setup.
The first backup takes several hours depending on how much data you have, so start it when you will not need your Mac.
If you run out of iCloud storage, backups stop until you delete old files or pay for more space.

Turning on iCloud backup for the first time

Open System Settings on your Mac by clicking the Apple menu in the top-left corner and selecting System Settings. Click your name at the top of the left sidebar — this opens your Apple ID settings. Then click iCloud in the left sidebar.

You will see a list of apps and data types with toggle switches next to them. Find the toggle for iCloud Backup and turn it on. Your Mac will ask you to confirm. Once you turn it on, your Mac will start backing up automatically the next time it meets the backup conditions: the Mac must be plugged into power, locked or asleep, and connected to Wi-Fi. The first backup can take several hours, so do this when you do not need to use your computer.

While the backup is running, you can check its progress by going back to System Settings, clicking your name, clicking iCloud, and looking at the iCloud Backup section. It will show you how much data is being backed up and roughly how much time remains.

Understanding iCloud storage and what happens when you run out

Apple gives you 5 gigabytes of free iCloud storage. This space is shared across all your devices — your Mac, iPhone, iPad, and any other Apple devices linked to your Apple ID. If you have a lot of photos, videos, or documents, 5 gigabytes fills up quickly. You can see how much storage you are using by going to System Settings, clicking your name, clicking iCloud, and looking at the storage meter at the top.

If your iCloud storage is full, backups will not run until you make room. You have three options: delete files you no longer need from your Mac (which frees up space in iCloud), delete old iCloud backups of devices you no longer own, or pay for more storage. Apple offers 50 gigabytes for $0.99 per month, 200 gigabytes for $2.99 per month, and 2 terabytes for $9.99 per month. The payment is automatic and appears on your Apple ID billing.

To delete an old backup, go to System Settings, click your name, click iCloud, click Manage, and look for the list of backups. You can delete backups from old devices you no longer use. Be careful not to delete the backup of your current Mac unless you are sure you do not need it.

What to do if a backup fails or does not start

If your Mac has not backed up in several days, first check that it is meeting the backup conditions: it must be plugged in, locked or asleep, and connected to Wi-Fi. Many people think backups happen while they are using the Mac, but they do not. Leave your Mac plugged in and connected to Wi-Fi overnight, and a backup should start automatically.

If your Mac is plugged in and on Wi-Fi but still has not backed up, check your iCloud storage. Go to System Settings, click your name, click iCloud, and look at the storage meter. If it says your storage is full, backups cannot run. Delete files or old backups to free up space, and the backup should start within a few hours.

If storage is not the problem, sign out of iCloud and sign back in. Go to System Settings, click your name, click iCloud, scroll to the bottom, and click Sign Out. Then sign back in with your Apple ID and password. This fixes most backup problems. If backups still do not start after that, restart your Mac and try again.

Restoring your Mac from an iCloud backup

You restore from an iCloud backup when you set up a new Mac or when your current Mac has serious problems. During the initial setup of a new Mac, you will see a screen that says "Restore from a Backup." Click that option and sign in with your Apple ID. Your Mac will show you a list of available backups — choose the one you want and click Restore. The process takes anywhere from 30 minutes to several hours depending on how much data is in the backup.

If your current Mac is having problems and you want to restore it, you will need to erase it first, which deletes everything on it. This is a serious step — only do this if your Mac is not working properly and you have already tried restarting it. To erase and restore, go to System Settings, click General, click Transfer or Reset, and follow the prompts. You will be asked whether you want to restore from an iCloud backup or set up as new. Choose iCloud backup and sign in with your Apple ID.

Backing up files that iCloud backup does not cover

iCloud backup does not back up files stored in external hard drives, USB drives, or SD cards. It also does not back up files in other cloud services like Google Drive, OneDrive, or Dropbox — those services keep their own backups. If you have important files in any of these places, you need a separate backup plan for them.

For external drives, the simplest approach is to use Time Machine, which is built into macOS. Connect an external hard drive to your Mac, go to System Settings, click General, click Time Machine, and turn it on. Choose your external drive as the backup disk. Time Machine will automatically back up your entire Mac to that drive every hour. This gives you a second copy of everything, separate from iCloud.

For files in other cloud services, those services usually keep their own backups and version history. Google Drive keeps deleted files in your trash for 30 days. OneDrive keeps versions of files for 93 days. Dropbox keeps deleted files for 30 days unless you pay for extended version history. These are not the same as a full backup, but they do protect you from accidental deletion.

Frequently Asked Questions

Does iCloud backup happen while I am using my Mac?

No. iCloud backups only run when your Mac is plugged in, locked or asleep, and connected to Wi-Fi. If you use your Mac all day and never lock it, backups will not start. Plug your Mac in and lock it (or let it sleep) overnight while it is on Wi-Fi, and the backup will run then.

Can I back up to iCloud and also use Time Machine?

Yes. iCloud backup and Time Machine serve different purposes and work together. iCloud backs up your Mac to Apple's servers so you can restore it on a new Mac. Time Machine backs up to an external drive so you can recover individual files or restore your Mac locally. Using both gives you two separate copies of your data.

What happens to my iCloud backup if I cancel my paid storage plan?

If you stop paying for extra storage and your backup is larger than 5 gigabytes, Apple will not delete it when ready. You have 30 days to either delete files to get under 5 gigabytes or renew your paid plan. After 30 days, if you are still over the limit, Apple will stop backing up new data, but your old backup remains until you sign out of iCloud.

Can I back up my Mac to iCloud without an Apple ID?

No. You must have an Apple ID to use iCloud backup. If you do not have one, you can create one for free at appleid.apple.com. You will need an email address and a password. Once you have an Apple ID, you can sign in on your Mac and turn on iCloud backup.

How often does iCloud backup run?

iCloud backup runs once per day, not continuously. It checks every time your Mac meets the backup conditions (plugged in, locked or asleep, on Wi-Fi) and runs if it has not backed up in the last 24 hours. If you make changes to your Mac and then when ready unplug it, those changes will not be in the backup until the next day's backup runs.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.