How do I backup my iPhone 6s Plus on my MacBook Pro?

Yajurveda Said:

"How do I backup my iPhone 6s Plus on my MacBook Pro?: [...]I now get the message "... not enough free space is available on this Mac". This is incorrect, since I have about 443 GB on my Mac, and the iPhone is 128 GB. I did not have any problem with backups, till I upgraded to Big Sur. Is there a workaround? Thank you."

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Troubleshooting iPhone and Mac Storage Inconsistencies:

Try installing an update. See this link: If you see "Software Update is Required to Connect to your iOS device" on your iPhone, iPad, or iPod touch - Apple Support

Yajurveda Said:

“How do I backup my iPhone 6s Plus on my MacBook Pro?: Thank you for the suggestion. I installed the update before I posted this question in this forum. I also rebooted my Mac and iPhone before trying the backup again.”

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You are welcome. Any success in doing so?