why do I keep getting the message that I donot have enough storage to back up - when there is 3.5GB free?
why do I keep getting the message that I donot have enough storage to back up - when there is 3.5GB free?
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Likely because the amount of space needed by the next backup exceeds your available space.
Check: Settings > Apple ID > icloud > icloud backup > {DEVICE NAME}
You'll then see the last backup, backup size and the next backup size. The next size can take some time to calculate.