The denizens of the backrooms have occasionally met up and banded together to survive the unknown hostilities of this world. Some decide to settle while others trek on, hoping to find an escape.
Locations
As most humans end up on Level 0 on their first no-clip, you would guess that you will find an abundance of Outposts, and you would be slightly correct. 600 million square miles of nothing but rooms will be a big divider on contact between individuals, but it is possible. Humans, with their hardy sense of survival, have settled down in the most peculiar of places in the backrooms and call it their home. Entire generations of people can live, work, and die in the backrooms without knowing of the outside world.
Outpost Issues and Problems.
The first major Issue of the backrooms is providing enough food for your outpost. Almond Water is a great source of hydration but won't provide enough sustenance. There have been instances of people carrying seeds with them to the backrooms, and successfully growing food in Level 0's shag carpet but a reliable source cannot be identified.
The next issue of an outpost is mental health, as newcomers, being shaken up by the sheer expanses of the backrooms, will have a detrimental effect on their mental health, exposure to any insanity-inducing Entities will also be very bad.
Thirdly, Defending your outpost against entities and raids is important, for obvious reasons. It's also to help maintain the fragile life we have in an outpost.
Lastly is the continuity between survivors. It may sound strange, but when a conversation was struck up by user u/Matrixbacon420 and an explorer during a meet up at The Hub, the subject of the world and natural history came up. User u/Matrixbacon420 was surprised to learn of the different history this explorer had. When asked to draw a map of his world, the explorer drew in some familiar-shaped continents resembling landmasses such as Asia, Antarctica, and Europe, but along with some new landmasses that had not been identified by u/Matrixbacon420. It seems that the backrooms is not limited to our universe, but is more of a large bridging gap between alike universes, suggesting calculated travel in the backrooms may lead to universes with diverging timelines from our own.