backup text messages

DaveGatt wrote:

How do I back up text messages from my Iphone xr

click here How to back up your iPhone, iPad, and iPod touch - Apple Support

If you are using iCloud Syncing for messages, they are not part of any backup.

If you want to archive them to your computer, consider an application such as PhoneView (Mac) or TouchCopy (Mac or Windows). Both will allow you to archive your messages as either pdfs or text files.