7 Days to Die: Corrupted Region Files (Causes & Fix)

Short version: a corrupted region file means one chunk of your world save can no longer be read, so the server refuses to start. It happens when the server is stopped in the middle of writing that region — a crash, a hard shutdown, an out-of-memory kill, or a power loss. The cleanest fix is to restore just that region from a recent backup; if you have no backup, you delete the region and the game regenerates it (you lose whatever was built in that small area). On our hosting the Backup/Fixer tool in your panel does this for you, and support can recover it from a day-1 or day-2 backup if you’d rather not touch anything.

What the error looks like

You’ll see one of these in your server log (log.txt), and the server exits instead of finishing startup:

• EXC Exception: Incorrect region file header!
• Err Invalid region file name (often points at an error_backup_* file)

The log line names the offending file. Region files live in your world save under the Region folder and are named like r.0.-1.7rg (the two numbers are the region’s map coordinates). Only the named region is damaged — the rest of your world is fine.

What actually causes it

The trigger is always the same: the server was interrupted while it was saving that region. That can be a game crash, a forced restart, the machine running out of RAM and killing the process, or a power loss.

But interruptions happen to every game — the reason 7 Days to Die ends up with a corrupted file instead of simply resuming is that it doesn’t write region files safely. Well-behaved software writes to a temporary file and only swaps it in once the write is fully complete (an “atomic” write), or keeps a journal it can roll back. 7DTD writes the region in place, so if the save is cut off half-way, the file is left in a broken, unreadable state rather than reverting to the last good copy. That missing crash-safety is a long-standing weakness of the engine, which is why this same error has shown up across Alpha builds, 1.0, and V3.0. In V3.0 the game at least tries to quarantine a bad region into an error_backup_* file on load, but that only sidelines the damage — it doesn’t recover your data.

A few things make it more likely: running the server with too little free RAM (the save can’t complete), antivirus or backup software locking the save folder mid-write, or overusing the chunk-reset command.

How to fix it

1. Restore the region from a backup (best, keeps your base). If you have a save from before the corruption, copy just the named r.X.Y.7rg file from the backup into your world’s Region folder, overwriting the broken one. On our hosting, the Backup/Fixer tool in your panel restores the affected region from an automatic day-1 or day-2 backup in a couple of clicks.
2. Find the file if you’re doing it by hand. Open log.txt, find the Incorrect region file header! line, and note the r.X.Y.7rg filename it reports. On V3.0 you can also look for the game’s error_backup_* quarantine files in the save folder — they’re named after the region the game flagged.
3. No backup? Delete the region to regenerate it. Delete the single named r.X.Y.7rg file. The game rebuilds that region from scratch on next load. This is safe for the rest of the world, but anything built or changed inside that one region is lost and reset to map default.
4. Let us handle it. Open a support ticket and we’ll recover the region from a backup for you — no FTP required.

How to stop it happening again

• Stop the server cleanly. Use the panel’s Stop/Restart (which lets the game finish its save) rather than killing the process. Our scheduled restarts already save before stopping.
• Keep automatic backups on. A daily backup turns “lost base” into a two-click restore. Our servers back up automatically, and you can download the whole save any time.
• Give the server enough RAM. A world that runs out of memory during a save is a classic cause — make sure your plan’s RAM comfortably covers your map size and player count.
• Exclude the save folder from antivirus/backup software on self-hosted setups, so nothing locks a region mid-write.

Is it a game bug or my host’s fault?

Both play a part, but it’s mostly on the game. The trigger can be anything that stops the server uncleanly — sometimes host-side (an out-of-memory kill, a node reboot), sometimes a game crash on your end. But the reason any interruption turns into permanent corruption is the game’s unsafe, non-atomic region writes: a well-engineered save simply wouldn’t leave a half-written file behind. A good host reduces the trigger (clean save-on-stop, enough RAM, frequent backups) — which is exactly what our panel and the Backup/Fixer tool are built to do — but it can’t retrofit crash-safety the game itself is missing.

Frequently asked

What causes corrupted region files in 7 Days to Die?

The server being interrupted while saving a region — a crash, hard shutdown, out-of-memory kill, or power loss. The game writes regions in place without an atomic/journaled save, so a half-finished write leaves the file corrupted instead of rolling back.

Can I fix it without losing my base?

Yes, if you have a backup: restore just the affected r.X.Y.7rg file from a save made before the corruption. Our Backup/Fixer tool does this from an automatic day-1 or day-2 backup. Without a backup, you have to delete and regenerate the region, which resets that one area.

Does deleting the region reset my whole map?

No — only that single region (a small square of the map) regenerates. The rest of your world, other players’ bases, and your character are untouched.

How do I stop it happening again?

Always stop the server cleanly (let it save), keep automatic daily backups on, and give the server enough RAM for your map and player count so saves can complete.

Running your server with us? The Backup/Fixer tool is already in your panel, and support can recover a corrupted region from backup on request. See our 7 Days to Die server hosting.