How do I get my iPhone back up to google one?
how do I get my iPhone stop backing out of cloud and start backing up to my Google one account
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It is not possible to make a backup to Google. If you make a backup on your iPhone, it can only be saved in iCloud. You can also make a backup and save it locally on your PC or Mac.
You can find more useful information on how to backup here:
How to back up your iPhone, iPad, and iPod touch - Apple Support