How do I backup my iPhones 6s before passcode is forgotten

Eatapplesxtz wrote:

How to backup iPhone 6s

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

I’m not quite sure what you’re asking about, here.

If you’ve forgotten the passcode, there’s no way to preserve the contents of the device, other than a backup made prior to forgetting the passcode.

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

If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support