Many iPhone and Mac users wonder what takes up iCloud storage before they run out of space. Understanding the main categories helps you manage your plan and avoid unexpected storage warnings.
Below is a quick reference that shows which data types typically use the most iCloud storage and how you can monitor them.
| Data Type | Stored in iCloud | Typical Impact on Storage | How to Check Size |
|---|---|---|---|
| Photos and Videos | iCloud Photos Library | High, depending on resolution and count | Settings > [Your Name] > iCloud > Manage Storage > Photos |
| Device Backups | iCloud Backup | Medium to high for large devices | Settings > [Your Name] > iCloud > Manage Storage > Backups |
| Messages and Attachments | iCloud synced Messages | Low to medium over time | Settings > [Your Name] > iCloud > Manage Storage > Messages |
| Mail and Notes | iCloud Mail, Notes, Contacts, Calendars | Low to medium depending on attachments | System Settings and iCloud drive usage |
| App Data and Documents | iCloud Drive and compatible apps | Variable, app dependent | Settings > [Your Name] > iCloud > Manage Storage > Apps |
Photos and Videos Storage Details
How iCloud Photos Uses Space
iCloud Photos keeps your full resolution originals in iCloud while your devices store optimized versions by default. Each original image or video can range from a few megabytes to hundreds of megabytes, which adds up quickly if you take 4K footage or hundreds of thousands of photos.
Managing Photo Library Size
You can review and reduce space by deleting unwanted originals, turning off My Photo Stream for older devices, and using the Optimize iPhone Storage setting. Periodically checking the Photos section in iCloud storage helps you avoid surprises on your billing cycle.
Device Backups and Data
What iCloud Backup Includes
An iCloud Backup captures settings, app data, home screen layout, and key account information from your iPhone or iPad. The size depends on the device, installed apps, and media, often ranging from a few hundred megabytes to multiple gigabytes for power users.
Controlling Backup Growth
Large backups can consume a significant portion of your plan because they update regularly when new data qualifies. You can exclude apps that do not need backup, delete old backups from the settings, and manage which apps store data in iCloud Drive instead.
Messages, Notes, and Communication Data
Impact of Message Attachments
iMessage, SMS, and other chat apps can store photos, videos, voice messages, and documents in iCloud when syncing across devices. Over time, attachment files can quietly grow your usage, especially in long conversations with high media volume.
Reducing Message Storage
You can set messages to expire after 30 days or two years, keep only recent attachments, and disable automatic downloading of attachments. Regularly archiving or clearing large conversations helps keep your iCloud storage predictable.
App Data, Drive, and Third Party Use
App Data and iCloud Drive
Many productivity and creative apps use iCloud Drive and iCloud Documents to store files, settings, and offline caches. Depending on how you use these apps, documents, exports, and temporary files can accumulate and consume a noticeable share of your plan.
Organizing App Storage
Review apps in your storage list, move large files to local storage or external services when appropriate, and clear cached data from apps that allow it. Keeping only essential app data in iCloud helps you stay flexible with your current storage tier.
Optimizing Your iCloud Plan
- Review Photos and Videos for original file size and remove unwanted keepers
- Check device backups and delete old or unnecessary backups from the list
- Audit Messages, Notes, and Mail attachments and expire old conversations
- Inspect app specific data in iCloud Drive and clear cache where possible
- Consider upgrading your plan or offloading to local storage and external drives for large media libraries
FAQ
Reader questions
Why does my iCloud storage show as almost full even though I have not backed up my device recently?
Photos and videos, especially high resolution originals, often represent the largest portion of iCloud storage. Messages with attachments, app data, and documents stored in iCloud Drive can also add up, so the usage may be tied to media and app files rather than recent backups.
Can deleting photos from my device free up iCloud storage immediately?
Deleting a photo from your device removes the optimized version locally, but the original in iCloud Photos remains until you delete it from iCloud Photos specifically. You must delete the photo from iCloud Photos or use the Delete and Remove from iCloud option to reduce storage right away.
Will turning off iCloud Backup delete my existing backups?
Turning off iCloud Backup stops future automatic backups, but your existing most recent backup remains stored in iCloud until you manually delete it or it gets replaced by a newer backup. You can manage and remove old backups in Settings under your iCloud storage usage.
How can I see which app is using the most iCloud storage?
Open Settings, tap your name, then iCloud, then Manage Storage. The breakdown screen shows each category and app with current usage and allows you to review and delete specific items directly from that menu.