Default {Q} Backing up kernel

Hello, I did a small search and couldn't find anything related to the g2. I'm trying to back up My current kernel which is stock 4.4.2 d80020k, and create it into a flashbacks zip. I'm rooted with twrp installed. Thanks for any tips.

Edit: what I think I'm looking for are the adb commands, dd. Just not sure on the exact path and command name. I don't want twrp to be my only option.

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LG-D800
Full stock
4.4.2