iCloud Storage

iCloud will no longer save your data, until you upgrade to more storage space.

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If you reach or exceed your iCloud storage limit, just buy more storage or make space available. 

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copied from: Upgrade your iCloud storage plan - Apple Support

lexigirl510 Said:

"iCloud Storage: What happens when my family runs out of available iCloud storage?"

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Then its time to remove items, or upgrade storage.