How to Host a HORROR - Into The Backrooms Server

Start from an 8 GB RAM floor. That's the recommended minimum for HORROR - Into The Backrooms on Fabric 1.20.1 — the pack is recipe-verified at that size, so treat 8 GB as the starting point, not a ceiling you try to shave down to save a couple euros.

Import the modpack through a clean install flow instead of zipping up a client instance and guessing which folders matter. A proper server-side import pulls only the files the server actually needs, which matters here since found-footage horror packs like this one often ship client-only camera/VHS-filter mods alongside the server-side logic.

Watch the console through the full first boot before you touch anything else. Fabric packs front-load a lot of mod init and world-gen work, and this pack's liminal-maze chunk generation plus whatever hunts you in it needs to spawn its systems cleanly — don't call it done until the log settles and the server reports it's fully loaded, not just that it's listening.

Only invite players once that first clean startup has actually finished. Dropping people into a half-initialized Backrooms world is how you get someone stuck in a broken hallway or staring at a maze that hasn't generated properly, which kills the horror pacing before it starts.

Take a backup before any world import, loader update, or config change. The endless-hallway progression in this pack is the whole point — players lose real exploration progress (and any found-footage-style run they were mid-recording) if a bad update corrupts the save, so back up first, change second.