Turn on iCloud Backup in Settings

Your iPhone backs up to iCloud when you plug it in to charge and connect to Wi-Fi — but only if you turn the feature on first. Most people never do this, which means their photos, messages, and contacts disappear if the phone breaks or gets lost.

Open Settings on your iPhone. Tap your name at the top of the screen, then tap iCloud. Scroll down and tap iCloud Backup. Toggle the switch to turn it on — it will turn green. That's it. From now on, whenever your phone charges overnight on Wi-Fi, it backs up automatically.

If you see a message saying your iCloud storage is full, you have two choices: pay for more storage (Apple offers 50 GB for 99 cents a month), or delete old backups from other devices you no longer use. To delete an old backup, go to Settings > your name > iCloud > Manage Account Storage > Backups, tap the old device name, and tap Delete Backup.

Key Takeaways

  • iCloud Backup happens automatically when your iPhone charges on Wi-Fi, but you must turn it on in Settings first.
  • A backup includes your photos, messages, contacts, calendar, app data, and settings — everything except apps themselves, which reinstall from the App Store.
  • You get 5 GB of iCloud storage free; if that fills up, you can delete backups from old devices or pay for more storage.
  • You can also back up to a Mac or Windows computer using a cable, which gives you a second copy in case iCloud fails.
  • Check that your backup actually completed by going to Settings > your name > iCloud > Manage Account Storage > Backups and looking for today's date.

What Gets Backed Up and What Doesn't

iCloud Backup saves your photos, messages, contacts, calendar events, reminders, voice memos, health data, home automation settings, and the data inside your apps — but not the apps themselves. When you restore from a backup, the apps reinstall from the App Store automatically, so you don't lose anything.

One thing that does not back up to iCloud: photos and videos you shot in the last few hours. iCloud Backup runs once per day, usually at night. If you need those recent photos backed up immediately, use iCloud Photos instead — it backs up every photo the moment you take it. To turn this on, go to Settings > your name > iCloud > Photos and toggle iCloud Photos on. This uses more storage but protects your photos in real time.

Back Up to Your Computer Instead (or As Well)

If you don't trust iCloud or want a second backup, you can plug your iPhone into a Mac or Windows computer and back up there. On a Mac, plug in your iPhone, open Finder, click your phone name in the sidebar, and click Back Up Now. On Windows, plug in your iPhone, open iTunes, click the device icon, and click Back Up Now.

Computer backups are encrypted and stored on your hard drive, not in the cloud. They back up everything — apps included — so they're more complete than iCloud Backup. The downside is you have to plug in the phone manually; it won't happen automatically. Many people do both: iCloud for everyday protection and a computer backup once a month as insurance.

Check That Your Backup Actually Worked

Backups fail silently all the time. Your phone might not be on Wi-Fi when you thought it was, or iCloud storage might have filled up without you noticing. To check whether your backup completed, go to Settings > your name > iCloud > Manage Account Storage > Backups. You'll see your device name and the date of the last backup. If that date is today or yesterday, you're protected. If it's a week old, something went wrong.

The most common reason backups fail is that your phone isn't staying on Wi-Fi long enough. Backup takes 10 to 30 minutes depending on how much data you have. If you charge your phone for only an hour before unplugging it, the backup might not finish. Leave it plugged in for at least two hours on Wi-Fi to be safe. If you travel a lot or use public Wi-Fi, consider backing up at home on your own network instead.

Restore from Your Backup When You Need It

When you get a new iPhone or your old one breaks and you replace it, you can restore everything from your backup. During the setup process on the new phone, you'll see a screen that says "Apps & Data." Choose Restore from iCloud Backup, sign in with your Apple ID, and select which backup you want to restore from. The phone will download everything — your photos, messages, settings, and app data — and you'll be back where you started.

Restoration takes time. If you have 50 GB of data, expect it to take an hour or more, depending on your internet speed. Don't unplug the phone or turn it off during this process. Once it finishes, your apps will reinstall from the App Store one by one in the background. You can use the phone while this happens, but it will be slow until all apps are done.

What to Do If iCloud Storage Is Full

If you see a message that your iCloud storage is full, your backup stops working. You have three options: delete old backups, delete photos and videos from iCloud Photos, or pay for more storage.

To see what's taking up space, go to Settings > your name > iCloud > Manage Account Storage. You'll see a list of apps and how much space each one uses. Photos and videos usually take the most room. If you have backups from old phones you no longer own, delete those first — go to Backups, tap the old device, and tap Delete Backup. If you still need more room, consider paying for 50 GB of storage (99 cents per month) rather than deleting years of photos.

Frequently Asked Questions

Does my iPhone back up when I'm not home?

No. iCloud Backup only works when your phone is plugged in, connected to Wi-Fi, and the screen is locked. If you charge your phone on cellular data or a public Wi-Fi network you're not connected to, the backup won't start. Plug in at home on your own network to be sure.

Can I back up my iPhone without Wi-Fi?

iCloud Backup requires Wi-Fi. If you want to back up on cellular, you can use a computer instead — plug your iPhone into a Mac or Windows PC with a cable and back up through Finder or iTunes. This works anywhere you have the computer.

What happens to my backup if I don't use iCloud for a month?

Apple keeps your backup for 180 days after your last backup. If you don't back up for six months, the backup deletes automatically and you lose it. If you travel or don't charge your phone regularly, set a calendar reminder to plug in at home once a month.

Can I see what's in my backup before I restore it?

No. You can see the date and size of the backup, but not what files are inside. If you're worried about restoring old or corrupted data, you can restore to a different backup date during setup — the restore screen shows all your recent backups and lets you pick which one to use.

Does backing up to my computer use my iCloud storage?

No. Computer backups are stored on your hard drive, not in iCloud. You can do both at the same time — iCloud for automatic protection and a computer backup as a second copy — without either one affecting your iCloud storage limit.