// modpack server guide
Into the Backrooms server hosting & setup guide
An Into the Backrooms server needs Java 17 and about 2.5–4 GB of RAM for up to 15 players.
The classic VHS backrooms experience, but in Minecraft!
Summary from Into the Backrooms: Found Footage Horror on Modrinth.
Into the Backrooms: Found Footage Horror is a Fabric modpack for Minecraft 1.20.1 with 29 mods. We'd pick our Standard plan (4 GB) for it.
Quick facts
| Loader | Fabric |
|---|---|
| Minecraft versions | 1.20.1 |
| Java needed | Java 17 for Minecraft 1.20.1 Java version chart. |
| Mods | 29 modsCounted from the pack's file list on Modrinth. None are marked client-only. |
| RAM | About 2 GB for 1–3 playersBy player count. |
| Downloads | 165,450 on Modrinth |
| Last updated | June 10, 2026 (version 1.0.3) |
| First published | July 6, 2025 on Modrinth |
| Server support | Required: the pack has mods that must run on the server. |
| Server pack | into the backrooms-found footage - server files 2.0.5.zipOfficial server pack on CurseForge, for Into the backrooms- Found Footage (horror)-2.0.5.zip. Checked October 5, 2026. |
| Modrinth tags | adventure, challenging, combat |
Into the Backrooms server files
Yes, on CurseForge. Modrinth has no separate server pack for Into the Backrooms, but the authors publish one on CurseForge: into the backrooms-found footage - server files 2.0.5.zip, for Into the backrooms- Found Footage (horror)-2.0.5.zip (October 4, 2026).
That's not the version Modrinth has (1.0.3). A server and its players must run the same pack version, so either install the client pack from CurseForge too, or build the server from the Modrinth pack instead. CurseForge lists it as an extra file rather than as that version's server pack, so installers that look for CurseForge's server pack won't find it: download it by hand.
How much RAM does an Into the Backrooms server need?
| Players online | RAM | DSN plan |
|---|---|---|
| 1–3 players | About 2 GB | Standard (4 GB) |
| 4–8 players | About 2–3 GB | Standard (4 GB) |
| 9–15 players | About 2.5–4 GB | Standard (4 GB) |
Estimated from 29 mods on the server with our RAM calculator, not measured: low end if players stay together, high end if they spread out.
Set Java's heap (-Xmx) 10–15% under the RAM you have, about -Xmx3500M on 4 GB. Fabric 1.20.1 takes it in the java command (-Xmx), usually in the start script. RAM guide.
Into the Backrooms server requirements
| Java | Java 17 |
|---|---|
| Loader | Fabric for Minecraft 1.20.1 |
| CPU | Fast single-core speed (one main thread). |
| RAM | About 2–4 GB for 1–15 players (table above) |
| Disk | The server files, a growing world and backups |
| Network | TCP port 25565 open to players |
Recommended plan
Our pick for Into the Backrooms
Standard
4 GB RAM · planned launch price $16/month
At about 29 Fabric mods this is a light pack, so 4 GB of RAM covers it for a small group.
Ordering is closed until we relaunch. We aren't taking orders or payments while we move to new hardware. Join the launch list and we'll email you when Standard servers open.
More than 15 players, or lots exploring at once? Go up to Premium (8 GB). Not sure? Email hello@dsnservers.com.
Planned launch price in USD, billed monthly once ordering opens, with a 7-day refund window.
How to make an Into the Backrooms server on your own PC
What's specific to Into the Backrooms, step by step. The full walkthrough for any pack: how to make a modded Minecraft server.
- Install Java 17.
Check with
java -version. Java version chart. - Get the server files.
Download the official server pack,
into the backrooms-found footage - server files 2.0.5.zip, from CurseForge and unzip it into an empty folder. Make sure your players install the same pack version. - Start it and accept the EULA.
Run the start script in the server files, or
java -jaron the Fabric 1.20.1 server launcher, then seteula=trueineula.txtif you accept Mojang's EULA (EULA step). - Set the RAM with
-Xmx, sized from the table above. - Let friends connect: forward TCP 25565, or use a tunnel or host behind CGNAT (can't connect?).
Or run Into the Backrooms on DSN
Once we relaunch (join the launch list), on DSN you'd install Into the Backrooms from the panel's Modrinth modpack installer (version 1.0.3), pick Java 17 on the Startup tab and accept the EULA in the console. No port forwarding.
How to play Into the Backrooms with friends
Each player installs Into the Backrooms version 1.0.3 with the Modrinth App or Prism Launcher, the same version as the server, and adds the server's address under Multiplayer.
Different versions of Into the Backrooms on the server and a client show up as Mismatched mod channel list or mod rejections. Why friends can't join, timeouts included.
Lag and performance on Into the Backrooms
Can't keep up! Is the server overloaded? means ticks take longer than 50 ms; more RAM won't fix that once Into the Backrooms has enough (tick lag guide). For Into the Backrooms:
- Measure first: spark's
/spark tpsand profiler work on 1.20.1 and name the mod or machine using the tick time. - Distances:
view-distance=8and a lowersimulation-distanceinserver.properties. - Pre-generate: Chunky for 1.20.1,
/chunky radius 3000then/chunky start, before people explore.
Common Into the Backrooms crashes
What a Fabric 1.20.1 server running Into the Backrooms hits most. For any other error, paste the log into the free crash log analyzer.
- Wrong Java version. Into the Backrooms on Minecraft 1.20.1 needs Java 17. Started on Java 8, it stops with
UnsupportedClassVersionError: ... class file version 61.0, this version of the Java Runtime only recognizes class file versions up to 52.0. Java version fix. - Out of memory. Into the Backrooms (29 mods on the server) needs about 2 GB for 1–3 players;
java.lang.OutOfMemoryErrormeans it ran out. Out-of-memory fix. - Client-only mod on the server. The Into the Backrooms pack file marks none of its mods client-only, so this usually means one was copied over from a player's mods folder. Check a mods list with the client-or-server-side checker. Client-only mod fix.
- After adding or updating a mod. Mods you add to Into the Backrooms by hand usually crash it with a missing dependency or a mixin conflict.
- Ticking entity or block entity. The crash report names it and gives its coordinates. Ticking entity fix.
Updates and support
Before moving Into the Backrooms past version 1.0.3, back up the world: see updating a modpack server without losing your world.
Bugs in Into the Backrooms itself go to its authors: Discord. Server problems on DSN: hello@dsnservers.com or Discord.
Packs like Into the Backrooms
More: all modpack guides and how to make a modded server.
Run Into the Backrooms on DSN when we relaunch.
Our pick, Standard: 4 GB, planned at $16/month.
DSN Servers isn't affiliated with Into the Backrooms: Found Footage Horror or Modrinth. The pack's icon, summary and stats come from Modrinth's public API (checked October 4, 2026).