iphone data

Hi Guys, I Lost my data entire data which is stored in my mobile. And, that is very important data that i need to recover. Is there any recovery apps for ios

I have an iPhone 7s plus, I want to backup my iPhone data using iCloud, how can I do that? to be honest, I would like to do this because I am going to replace it with iPhone 7s plus or iPhone X which is more modern and better these days. :)