What iCloud does and why you'd turn it on
iCloud is Apple's cloud storage service that automatically backs up your photos, documents, contacts, and settings to Apple's servers. When you turn it on, your iPhone, iPad, or Mac will upload this information in the background — usually when the device is plugged in and on Wi-Fi — so you have a copy stored safely away from your device.
The main reason to enable iCloud is protection against loss. If your phone gets stolen, breaks, or you upgrade to a new device, you can restore everything from your iCloud backup instead of starting from scratch. You also get access to your files and photos across all your Apple devices — open a document on your Mac, and it appears on your iPad without you doing anything.
Apple gives you 5 gigabytes of free storage. Photos, documents, and backups all count toward that limit. Once you hit the limit, you can either delete old backups and files or pay for more storage (plans start at 50 gigabytes per month). You do not have to pay anything to turn iCloud on — you only pay if you run out of space and want more.
Key Takeaways
- iCloud turns on through Settings on iPhone and iPad, or System Settings on Mac, and requires your Apple ID password.
- Your first 5 gigabytes of storage are free, and backups happen automatically when your device is plugged in and connected to Wi-Fi.
- You can choose which apps and data types back up to iCloud — photos, mail, contacts, reminders, and others can be toggled on or off individually.
- If you run out of free storage, you can delete old backups or pay for a larger plan, but the service itself remains free to use.
Turning on iCloud on iPhone or iPad
Open the Settings app and tap your name at the very top of the screen. You will see your Apple ID, iCloud, and other account options. Tap iCloud.
You will see a list of apps and services — Photos, Mail, Contacts, Reminders, Notes, and others. Each one has a toggle switch next to it. Turn on the ones you want to back up. Most people turn on Photos, Mail, Contacts, and Reminders at minimum. If you turn on Photos, Apple will also ask whether you want to use iCloud Photos (which stores full-resolution originals) or iCloud Photo Library (which stores smaller versions to save space). Choose whichever fits your needs.
Scroll down and tap iCloud Backup. Turn on the toggle that says "Back Up This iPhone" or "Back Up This iPad". Once it is on, your device will back up automatically whenever it is plugged in, locked, and connected to Wi-Fi. You do not need to do anything else — it happens in the background.
Turning on iCloud on Mac
Click the Apple menu in the top-left corner and select System Settings (or System Preferences on older Macs). Click General in the sidebar, then click About. Near the top you will see your Apple ID. Click iCloud in the sidebar instead.
You will see the same list of apps and services as on iPhone — Photos, Mail, Contacts, Notes, and others. Check the boxes next to the ones you want to sync and back up. On Mac, iCloud works slightly differently than on iPhone: it syncs your files continuously rather than backing up at set times, so changes appear across your devices almost when ready.
If you want to back up your entire Mac (not just individual apps), scroll down and look for iCloud Drive. Turn it on, and your Documents and Desktop folders will sync to iCloud. This is different from a full system backup — it only backs up files you store in those two folders, not your applications or system settings.
Understanding iCloud storage and what counts toward your limit
Your free 5 gigabytes covers everything: iCloud backups, photos, documents in iCloud Drive, mail, and any other data you store. Once you use 5 gigabytes, iCloud will stop backing up new data until you delete something or pay for more space.
Photos take up the most space. If you have thousands of photos on your phone, your backup may fill up quickly. You can save space by turning off iCloud Photos and instead using iCloud Photo Library with optimized storage — this keeps full-resolution originals on Apple's servers and stores smaller versions on your device. Mail also takes significant space if you have years of messages. Deleting old emails frees up iCloud storage.
To check how much space you are using, go to Settings > [Your Name] > iCloud on iPhone or iPad, or System Settings > [Your Name] > iCloud on Mac. You will see a bar showing how much of your 5 gigabytes is in use and what is taking up space. If you are close to the limit, you can delete old backups by tapping "Manage Storage" and selecting backups to remove.
What happens if you run out of space
When your iCloud storage is full, your device will stop backing up automatically. You will see a notification saying your iCloud storage is full. At that point you have two choices: delete old data to free up space, or pay for more storage.
To delete old backups, go to Settings > [Your Name] > iCloud > Manage Storage on iPhone or iPad. You will see a list of backups for each of your devices. Tap one and select "Delete Backup". This removes that device's backup from iCloud but does not affect the device itself — your phone or iPad still has all its data. You can create a new backup later.
If you want to keep all your backups, Apple offers paid plans: 50 gigabytes for about $0.99 per month, 200 gigabytes for about $2.99 per month, and 2 terabytes for about $9.99 per month. Pricing varies by country. You can upgrade from Settings > [Your Name] > iCloud > Manage Storage > Change Storage Plan on iPhone, or from System Settings on Mac. The upgrade is when ready, and you can downgrade or cancel anytime.
Turning off individual apps or disabling iCloud entirely
You do not have to back up everything. If you want iCloud on but do not want your photos backed up, go to Settings > [Your Name] > iCloud on iPhone or iPad and turn off the Photos toggle. Your photos stay on your device, but they will not sync to iCloud or appear on your other devices. You can turn individual apps on and off anytime without affecting the others.
If you want to turn off iCloud completely, go to Settings > [Your Name] > iCloud and scroll to the bottom. Tap "Sign Out". You will be asked whether to keep a copy of your iCloud data on this device or delete it. If you keep a copy, your photos and documents stay on your phone but will not sync to your other devices or back up to iCloud. If you delete, they are removed from this device (but remain on iCloud and your other devices). After you sign out, iCloud is off and your device will not back up.
Frequently Asked Questions
Does iCloud cost money?
No. iCloud is free to turn on and use. You get 5 gigabytes of free storage. You only pay if you want more than 5 gigabytes — plans start at about $0.99 per month for 50 gigabytes. You can use iCloud indefinitely without paying anything as long as you stay within the free limit.
How long does a backup take?
Your first backup can take anywhere from a few minutes to an hour, depending on how much data you have and your Wi-Fi speed. After that, backups are incremental — they only upload changes, so they are much faster. Backups happen automatically in the background when your device is plugged in and on Wi-Fi, so you will not notice them.
Can I use iCloud on Android or Windows?
iCloud is designed for Apple devices, but you can access some iCloud features on Android or Windows through iCloud.com. You can view and read photos, access iCloud Mail, and manage your account, but you cannot back up an Android phone or Windows computer to iCloud. For those devices, you would use Google Drive, OneDrive, or another service.
What if I switch to a different iPhone or iPad?
When you set up a new Apple device, you will be asked to sign in with your Apple ID. Once you do, you can restore from your iCloud backup — the new device will read your photos, contacts, mail, and other data from iCloud. This usually takes 15 minutes to an hour depending on how much data you have and your Wi-Fi speed.
Can someone else access my iCloud backup?
No. Your iCloud backup is encrypted and tied to your Apple ID. Only you can access it with your password. If someone else signs in with their own Apple ID on your device, they cannot see your iCloud data — they would create their own separate backup.