How do I direct my backup to an external drive on my MacBook Sir running Ventura 13.0.1
How to direct my iPhone backup to an external drive on my MacBook Air running Ventura 13.0.1
iPhone 14 Pro
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AFAIK the iPhone Backup can not be directly to backup to an External Drive Directly from within Finder
The may be able to track down where the backup is located on the Internal Drive via the below Instructions from Apple.
There after >> Copy the Backup to the External Drive
Locate backups of your iPhone, iPad, and iPod touch - Apple Support
Excerpt from above link
Copy backups to another location
If you need copies of your backups, you can find the Backup folder and copy the entire folder to another place, like an external drive or network-storage location.
Time Machine automatically copies your Backup folder when you back up the Home folder on your Mac.