If you've updated your iPhone to iOS 16.2, the following article from Wirecutter describes how to turn on a new security feature - - end to end encryption for your iCloud backup -- if you're inclined to do so.
Jim Hamm
Wirecutter: Why You Should Enable Apple’s New Security Feature in iOS 16.2 Right Now
https://www.nytimes.com/wirecutter/reviews/how-to-set-up-apples-new-icloud-encryption-security-feature/