To change the Google account that Google Photos uses for backup, follow these steps:
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Launch the Google Photos application on your device.
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Tap on your profile icon located at the top right corner of the screen.
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Select either "Backup Account" or "Backing up to another account." The exact wording may vary slightly depending on your app version.
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Enter your personal Google account details and sign in to the Google account you want to use for backing up your photos and videos.
By following these steps, you will effectively switch the Google account associated with your Google Photos backup.