Some cleanup and comments...

src/main/java/net/szum123321/textile_backup/Statics.java

@@ -40,6 +40,6 @@ public class Statics {
     public final static DateTimeFormatter defaultDateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd_HH.mm.ss");
 
     public static final AtomicBoolean globalShutdownBackupFlag = new AtomicBoolean(true);
-    public static AwaitThread restoreAwaitThread;
+    public static AwaitThread restoreAwaitThread = null;
     public static File untouchableFile;
 }

src/main/java/net/szum123321/textile_backup/core/Utilities.java

@@ -18,7 +18,6 @@
 
 package net.szum123321.textile_backup.core;
 
-import net.fabricmc.loader.api.FabricLoader;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.util.registry.Registry;
 import net.minecraft.util.registry.RegistryKey;

src/main/java/net/szum123321/textile_backup/core/restore/AwaitThread.java

@@ -20,6 +20,9 @@ package net.szum123321.textile_backup.core.restore;
 
 import net.szum123321.textile_backup.Statics;
 
+/*
+    This thread waits some amount of time and then starts a new, independent thread
+*/
 public class AwaitThread extends Thread {
     private final int delay;
     private final Runnable taskRunnable;
@@ -31,7 +34,7 @@ public class AwaitThread extends Thread {
 
     @Override
     public void run() {
-        Statics.LOGGER.info("Countdown begins...");
+        Statics.LOGGER.info("Countdown begins... Waiting {} second.", delay);
 
         // 𝄞 This is final count down! Tu ruru Tu, Tu Ru Tu Tu ♪
         try {

src/main/java/net/szum123321/textile_backup/mixin/MinecraftServerMixin.java

@@ -21,12 +21,14 @@ package net.szum123321.textile_backup.mixin;
 import net.minecraft.server.MinecraftServer;
 import net.szum123321.textile_backup.core.LivingServer;
 import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Unique;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
 @Mixin(MinecraftServer.class)
 public class MinecraftServerMixin implements LivingServer {
+    @Unique
     private boolean isAlive = true;
 
     @Inject(method = "shutdown", at = @At("TAIL"))
@@ -34,6 +36,7 @@ public class MinecraftServerMixin implements LivingServer {
         isAlive = false;
     }
 
+    @Unique
     @Override
     public boolean isAlive() {
         return isAlive;