Backing up iPhone XR
How can I back up my phone? I
tunes is not on my MacBook.
iPhone XR, iOS 14
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If you're using Catalina or later, iTunes was replaced by Finder for that job What happened to iTunes? - Apple Support
See this Backup methods for iPhone, iPad, and iPod touch - Apple Support
I also advise you to use a computer method, not only the iCloud one, so you'll have a full backup with things that iCloud doesn't save.