A backup is a copy of everything on your iPhone stored somewhere else
An iPhone backup is a complete snapshot of your phone — your photos, messages, contacts, app settings, passwords, health data, and everything else — saved to a separate location. If your phone breaks, gets lost, or stops working, you can restore that backup to a new phone and get your data back exactly as it was.
Apple gives you two ways to back up: to iCloud (Apple's cloud storage) or to a computer using a cable. Both methods do the same job — they copy your data somewhere safe. The difference is where that copy lives and how you access it.
Without a backup, if your phone is damaged or stolen, that data is gone. With a backup, you can move to a new phone and pick up where you left off within minutes.
Key Takeaways
- A backup copies everything on your iPhone — photos, messages, apps, settings, and passwords — to iCloud or a computer so you can restore it later.
- iCloud backups happen automatically over WiFi if you turn them on in Settings, while computer backups require you to plug in your phone each time.
- iCloud gives you 5 GB free, which covers most people unless you have thousands of photos; a computer backup uses your computer's storage instead.
- Restoring from a backup takes 10 to 30 minutes depending on how much data you have and your internet speed.
- You can back up to iCloud and a computer at the same time, so you have two copies of your data.
How iCloud backups work
iCloud is Apple's cloud storage service. When you turn on iCloud backup, your iPhone automatically backs up to Apple's servers every time you plug it in to charge and connect to WiFi. You do not have to do anything — it just happens in the background.
To turn it on, go to Settings, tap your name at the top, select iCloud, then tap iCloud Backup and turn it on. Your phone will back up the next time it meets those conditions (charging and on WiFi). You can also force a backup when ready by going back to that same screen and tapping "Back Up Now".
iCloud gives you 5 GB of free storage. For most people, that covers photos, messages, and app data. If you have thousands of photos or large video files, you may run out of space — Apple will tell you when that happens, and you can buy more storage (50 GB, 200 GB, or 2 TB) for a monthly fee.
How computer backups work
A computer backup stores your data on your Mac or Windows PC instead of in the cloud. You plug your iPhone into the computer with a USB cable, open Finder (on Mac) or iTunes (on Windows), and click the backup button. The entire backup happens on your computer's hard drive.
Computer backups do not happen automatically — you have to plug in and back up each time. But they have an advantage: they use your computer's storage, not iCloud's limited free space. If your computer has room, you can back up as much as you want without paying anything.
Computer backups are also faster than iCloud if you have a lot of data, because the data travels through a cable instead of over the internet.
What gets backed up and what does not
A backup includes almost everything: your photos and videos, messages and call history, contacts, calendar events, notes, reminders, health and fitness data, app settings, and your saved WiFi passwords. It also includes which apps you have installed, so when you restore, those apps read automatically.
Some things do not back up: content you bought from iTunes or the App Store (Apple can re-read those), anything stored only in iCloud Drive or other cloud services, and data from apps that store information only on their own servers (like banking apps or social media). Those apps will still be on your phone after a restore, but you may need to log back in.
Your backup also does not include your Apple ID password or two-factor authentication codes. You will need those to set up the phone, so keep them somewhere safe.
Restoring from a backup
When you set up a new iPhone or erase your current one, you get the option to restore from a backup. If you backed up to iCloud, you sign in with your Apple ID and choose which backup to restore. If you backed up to a computer, you plug in the phone and choose the backup in Finder or iTunes.
The restore process takes 10 to 30 minutes depending on how much data you have. During that time, your phone will restart and read your data. Do not unplug it or turn it off. Once it finishes, everything will be exactly as it was on your old phone.
If you have multiple backups (say, one from last week and one from today), you can choose which one to restore. This is useful if you deleted something important and want to go back to an older version of your phone.
iCloud versus computer: which should you use
iCloud is easier because it backs up automatically without you doing anything. You do not need a computer or a cable. The downside is the 5 GB limit and the fact that your data lives on Apple's servers (though Apple encrypts it).
A computer backup gives you unlimited storage and keeps your data on hardware you own. The downside is that you have to remember to plug in and back up, and you need a computer nearby.
The best approach is to use both. Turn on iCloud backup for automatic protection, and plug into a computer once a month or once a quarter for a second copy. That way, if iCloud has a problem or your computer fails, you still have the other backup.
What to do if your backup is too large for iCloud
If you see a message that your backup is too large, you have three options. First, you can delete old backups — go to Settings, tap your name, select iCloud, then Manage Storage, and look for old device backups you no longer need. Deleting a backup does not affect your phone, only the copy in iCloud.
Second, you can turn off backup for apps or data types you do not need. In the same Manage Storage screen, you can choose not to back up certain apps or turn off photo backup (though your photos will still be on your phone). This frees up space for the things that matter most to you.
Third, you can buy more iCloud storage. Apple's pricing starts at $0.99 per month for 50 GB. If you have a family, you can share a larger plan with up to five other people.
Frequently Asked Questions
Can I back up my iPhone without WiFi?
iCloud backups require WiFi, but computer backups work over a USB cable and do not need internet. If you do not have WiFi at home, a computer backup is your best option. You can also back up at a coffee shop or library that has free WiFi.
How often should I back up my iPhone?
If you use iCloud backup, it happens automatically every time you charge and connect to WiFi, so you do not have to think about it. If you use a computer, back up at least once a month, or more often if you take a lot of photos or create important documents.
Will restoring a backup delete everything on my new phone?
Yes. When you restore from a backup, it overwrites everything on the new phone with the data from the backup. That is why you should only restore to a brand-new phone or one you have erased. If you restore to a phone that already has data on it, that data will be replaced.
What if I lose my iPhone before I back it up?
If you have iCloud backup turned on, your last backup is safe in the cloud even if the phone is gone. You can restore it to a new iPhone. If you never turned on iCloud backup and never backed up to a computer, that data is lost. This is why turning on backup when ready after you get a new phone matters.
Can I back up to a different computer than the one I usually use?
Yes. You can plug your iPhone into any Mac or Windows PC and back up to it. Each computer will create its own backup, so you can have multiple backups on different computers. Just make sure you trust the computer — backups contain sensitive information like passwords.