Symptoms
- Notification says iCloud storage is full
- Photos stop syncing across devices
- Device backup fails with a storage error
- Can't send or receive iCloud Mail
Likely causes
- CommonFree 5GB iCloud storage tier used up by photos, backups, and app dataApple's default free tier fills up quickly with modern photo and video file sizes.
- CommonOld device backups taking up significant spaceBackups from previous or unused devices often linger and consume storage.
- PossiblePhotos and videos not offloaded or optimizedFull-resolution media uses considerably more space than optimized versions.
- PossibleMultiple apps backing up data to iCloud unnecessarilySome apps default to iCloud backup for data you may not need preserved there.
What to do
- Check iCloud storage usage in Settings > [your name] > iCloud > Manage Storage to see what's taking up space.
- Delete old or unused device backups, especially from phones or tablets you no longer own.
- Review and delete unnecessary large files, especially old message attachments and app data backups.
- Consider upgrading to a paid iCloud storage tier if you regularly need more space, which is often the simplest fix for ongoing needs.
- Turn off iCloud backup for specific apps you don't need backed up there.
- Empty 'Recently Deleted' in Photos, since deleted photos still count against storage until permanently removed.
When to call a pro
This is entirely self-serviceable through account settings; no professional help is needed.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.