diff --git a/bundler/src/main/java/io/ib67/sfcraft/bundler/BundleReader.java b/bundler/src/main/java/io/ib67/sfcraft/bundler/BundleReader.java
index 21cc63c..0e618d1 100644
--- a/bundler/src/main/java/io/ib67/sfcraft/bundler/BundleReader.java
+++ b/bundler/src/main/java/io/ib67/sfcraft/bundler/BundleReader.java
@@ -33,7 +33,6 @@ public class BundleReader {
     }
 
     public void extract(Path bundle, Path destination) throws IOException {
-        var symbolsToLink = new HashMap<String, String>();
         var readMaps = new HashMap<String, Long>();
         try (var zstd = new ZstdInputStreamNoFinalizer(Files.newInputStream(bundle, StandardOpenOption.READ));
              var in = new EntryInputStream(zstd)) {
diff --git a/bundler/src/main/java/io/ib67/sfcraft/bundler/region/RegionParser.java b/bundler/src/main/java/io/ib67/sfcraft/bundler/region/RegionParser.java
index ea527d9..0cec9df 100644
--- a/bundler/src/main/java/io/ib67/sfcraft/bundler/region/RegionParser.java
+++ b/bundler/src/main/java/io/ib67/sfcraft/bundler/region/RegionParser.java
@@ -119,7 +119,7 @@ public class RegionParser implements Closeable {
             case 2 -> new DeflaterInputStream(new ByteBufInputStream(in));
             case 3 -> new ByteBufInputStream(in);
             case 4 -> new LZ4BlockInputStream(new ByteBufInputStream(in));
-            // user defined compression algorithm, no going to support.
+            // user defined compression algorithm, not going to support.
             // (or mcc)
             default -> throw new IOException("Unsupported compression type. " + compressionType);
         };
diff --git a/src/main/java/io/ib67/sfcraft/BackupWorker.java b/src/main/java/io/ib67/sfcraft/BackupWorker.java
index 1bb680a..bc3d587 100644
--- a/src/main/java/io/ib67/sfcraft/BackupWorker.java
+++ b/src/main/java/io/ib67/sfcraft/BackupWorker.java
@@ -44,7 +44,6 @@ public record BackupWorker(
             // tmp file path
             log.info("Creating bundle {}", tmpBundle);
             BundleWriter.createBundle(tmpBundle, subject.changedFiles(), config);
-            return strategy.createBackup(subject.name(), subject.root(), tmpBundle);
         } catch (Exception e) {
             throw e;
         } finally {
@@ -55,7 +54,9 @@ public record BackupWorker(
                 log.error("Expect BACKUP state but got {}", BACKUP_LOCK.get());
                 Thread.sleep(2000);
             }
-            Files.deleteIfExists(tmpBundle);
         }
+        var result = strategy.createBackup(subject.name(), subject.root(), tmpBundle);
+        Files.deleteIfExists(tmpBundle);
+        return result;
     }
 }
diff --git a/src/main/java/io/ib67/sfcraft/WorldDir.java b/src/main/java/io/ib67/sfcraft/WorldDir.java
deleted file mode 100644
index dc6d917..0000000
--- a/src/main/java/io/ib67/sfcraft/WorldDir.java
+++ /dev/null
@@ -1,60 +0,0 @@
-package io.ib67.sfcraft;
-
-import lombok.SneakyThrows;
-
-import java.nio.file.FileVisitOption;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-import java.util.stream.Collectors;
-
-public record WorldDir(
-        Path root
-) {
-    public Path region() {
-        return root.resolve("region");
-    }
-
-    public Path poi() {
-        return root.resolve("poi");
-    }
-
-    public Path entities() {
-        return root.resolve("entities");
-    }
-
-    @SneakyThrows
-    public List<WorldDir> otherDimensions() {
-        try (var w = Files.walk(root)) {
-            return w.filter(it -> Files.exists(it.resolve("region")) && Files.exists(it.resolve("poi")))
-                    .map(WorldDir::new)
-                    .toList();
-        }
-    }
-
-    /**
-     * @return Files expect poi, region, entities, playerdata and things in dimension folder.
-     */
-    @SneakyThrows
-    public List<Path> otherFiles() {
-        var otherDimensions = otherDimensions();
-        try (var f = Files.walk(root)) {
-            return f.filter(it -> Files.isRegularFile(it)
-                            && otherDimensions.stream().noneMatch(a -> it.startsWith(a.root)))
-                    .filter(it -> !it.getFileName().toString().contains("session.lock"))
-                    .toList();
-        }
-    }
-
-    @SneakyThrows
-    public List<Path> everything() {
-        try (var f = Files.walk(root)) {
-            return f.filter(Files::isRegularFile)
-                    .filter(it -> !it.getFileName().toString().contains("session.lock"))
-                    .toList();
-        }
-    }
-}
diff --git a/src/main/java/io/ib67/sfcraft/mixin/MixinRegionBasedStorage.java b/src/main/java/io/ib67/sfcraft/mixin/MixinRegionBasedStorage.java
index db050b9..5f65f73 100644
--- a/src/main/java/io/ib67/sfcraft/mixin/MixinRegionBasedStorage.java
+++ b/src/main/java/io/ib67/sfcraft/mixin/MixinRegionBasedStorage.java
@@ -31,8 +31,18 @@ public abstract class MixinRegionBasedStorage {
         if (witness == IOState.BACKUP) {
             // yield out and keep blocking.
             // The backup worker will wait for us setting this back to backup.
+            int i =0;
             Globals.BACKUP_LOCK.set(IOState.BACKUP);
             while (Globals.BACKUP_LOCK.getAcquire() == IOState.BACKUP) {
+                if(i==0){
+                    System.out.println("Server is performing backup, ChunkIO will wait for it.");
+                }
+                if(i++ > 3000){
+                    System.err.println("WARNING: BACKUP_LOCK is holding for 10 minutes!");
+                    System.err.println("ChunkIO will not wait for backup anymore, writting to disk...");
+                    System.err.println("You may adjust this behaviour in configuration");
+                    break;
+                }
                 Thread.sleep(2000);
             }
         }
@@ -42,7 +52,7 @@ public abstract class MixinRegionBasedStorage {
                 value.sync();
             }
         } finally {
-            // we asserts that there are no other threads calling sync()
+            // we assert that there are no other threads calling sync()
             // so we can just jump back to the witness value.
             // witness: AUTO_SAVE or IDLE
             Globals.BACKUP_LOCK.compareAndExchange(IOState.STORAGE_SYNC, witness);