[CaptainCrunch]

So a lot of Snoke's backstory has been laid out in the Novel being released this month

https://movieweb.com/snoke-past-myst...ok-adaptation/

Spoiler!

According to The Last Jedi novelization, which was written by Jason Fry with the assistance of Rian Johnson, Snoke was the unexpected leader of the First Order. The last of the Imperial leadership, Gallius Rax, Sloane, the political lunatic Ormes Apolin or even Brendol Hux, who survived the Battle of Jakku did not see Snoke's rise to power and were surprised when it occurred. Snoke either killed them or had them arranged to be killed except for Hux, who he used as a tool and his rise within the First Order was not by plan, but was instead more opportunistic.

I would expect that this will be explored in a future novel because Rae Sloan was a major character in the new EU, to the point where she was pretty much the military architect of the First Order

After the Battle of Jakku and the destruction of the Empire, the First Order began stockpiling weapons and started laboratories in the Unknown Regions as well as shipyards and storehouses. It isn't clear when Snoke stepped up and took control or if it was right from the start, but The Last Jedi novel states that Snoke saved the First Order from many enemies. It is also said that Snoke finds many Force truths in the Unknown Regions that were reportedly "waiting to be found." The book goes on to say that Snoke and Luke Skywalker had met once before, but it is not clear if Luke knew of Snoke's evil intentions. Luke's intentions were to learn more about Jedi lore and Snoke reportedly respected that he was out looking for truth.

It doesn't sound like there was a violent confrontation there. So how did he get those scars.

t appears that Snoke was also looking for his truth in the Force and might not have always have been evil. When Snoke was younger, he learned that the "future is always in motion" and said, "Be careful or die." Snoke now realizes that the Force visions are "often incomplete." Additionally, it is revealed that Snoke originally wanted Rey as an apprentice and did not want her for his power like Emperor Palpatine needed Luke Skywalker. It's also shown that Snoke contemplated killing Kylo Ren, even though he believes that Ben Solo is capable of greatness. All in all, that's a lot more about Snoke than we knew previously and should go a long way in helping out fans who were disappointed in the lack of Snoke backstory in The Last Jedi.

I still think we've seen the last of Snoke, he was a powerful Redshirt, that's all.