Need to talk to someone in customer service
Need to talk to someone in customer Service regarding how to update my iCloud storage payment and make sure devices are backed up correctly before transferring data
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This explains how to update payment information. If you want to change payment methods, add the new card first, then remove the old card.
Change, add, or remove Apple ID payment methods - Apple Support
This explains how to transfer the data from your old device to the new one.
Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support
Thes is a link at the beginning of the article to take you to the support article on how to backup.