How to back up two iPhones to one computer
How do I back up two iphones to the same Mac?
MacBook Pro 13″, macOS 11.1
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Follow the same procedure for each one as outlined in How to back up your iPhone, iPad and iPod touch – Apple Support.
Be sure that each one of them has a different name, before initiating the backup: Change the name of your iPhone, iPad or iPod using your computer – Apple Support.