How to Backup kernel?

[Guest barnir]

Hey guys, i want to backup my current stock kernel, im not sure if it was tweaked by my operator thats why i would like to backup it, if it is possible ofc, can anyone help?

My rom is from MEO B191 (last available) Portuguese 

[Guest SH3H1]

Backup boot.img from TWRP , that's what kernel is (the boot.img :) )

[Guest barnir]

thank you mate :)