Hey guys. Like an idiot I deleted all my backup files and just completed a faction's campaign. Is it possible to backstab my current faction to complete another factions's campaign or do I have to completely restart?

It's Bethesda, I'm sure you can join all the factions just like irl.

Considering you have to activly attack other factions as part of the faction questline, nope, you can snatch some early benefits from all factions, but at one point ya basically have to settle for one if you wanna advance further.

You actually can't do all faction endings.

But hey, talking [censored] is fun right?

This. I've completed the main campaign (or what I assume is the "main" one, was wondering if I could complete a different faction since their missions are still possible but I've killed their ally. I'm probably not gonna bother trying since I have to restart anyway.