What does iCloud back up?
what is the different of iPhone6 and iPhone 6s?
iPhone 6s
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are you asking 2 different questions? You came here from a support article that is titled exactly the same as your post title.. If you want to know what iCloud backs up, go back to that article
you can see differences between iPhone 6 & 6s here
https://www.apple.com/iphone/compare/?modelList=iphone6,iphone6s,iphoneSE3rdgen
most notably from an iOS perspective.. an iPhone 6 can only run up to iOS 12, whereas an iPhone 6s can run up to iOS 15