diff --git a/src/main/java/net/szum123321/textile_backup/ConfigHandler.java b/src/main/java/net/szum123321/textile_backup/ConfigHandler.java
index 45a9b75..af600db 100644
--- a/src/main/java/net/szum123321/textile_backup/ConfigHandler.java
+++ b/src/main/java/net/szum123321/textile_backup/ConfigHandler.java
@@ -87,10 +87,24 @@ public class ConfigHandler {
     public Set<String> playerBlacklist = new HashSet<>();
 
     @Comment("\nFormat of date&time used to name backup files.\n" +
-            "Remember not to use '#' symbol and any other character that is not allowed by your operating system such as:\n" +
-            "':', '\\', etc\n")
+            "Remember not to use '#' symbol or any other character that is not allowed by your operating system such as:\n" +
+            "':', '\\', etc...\n" +
+            "For more info: https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html\n")
     public String dateTimeFormat = "dd.MM.yyyy_HH-mm-ss";
 
+    public Optional<String> sanitize() {
+        if(compressionCoreCountLimit > Runtime.getRuntime().availableProcessors())
+            return Optional.of("compressionCoreCountLimit is too big! Your system only has: " + Runtime.getRuntime().availableProcessors() + " cores!");
+
+        try {
+            DateTimeFormatter.ofPattern(dateTimeFormat);
+        } catch (IllegalArgumentException e) {
+            return Optional.of("dateTimeFormat is wrong!\n" + e.getMessage() + "\n See: https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html");
+        }
+
+        return Optional.empty();
+    }
+
     public enum ArchiveFormat {
         ZIP(".zip"),
         GZIP(".tar.gz"),
diff --git a/src/main/java/net/szum123321/textile_backup/TextileBackup.java b/src/main/java/net/szum123321/textile_backup/TextileBackup.java
index 0e20340..123ea11 100644
--- a/src/main/java/net/szum123321/textile_backup/TextileBackup.java
+++ b/src/main/java/net/szum123321/textile_backup/TextileBackup.java
@@ -23,7 +23,6 @@ import io.github.cottonmc.cotton.config.ConfigManager;
 
 import net.fabricmc.api.ModInitializer;
 import net.fabricmc.fabric.api.command.v1.CommandRegistrationCallback;
-import net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents;
 import net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents;
 import net.minecraft.server.command.ServerCommandSource;
 import net.szum123321.textile_backup.commands.BlacklistCommand;
@@ -34,6 +33,7 @@ import net.szum123321.textile_backup.core.BackupScheduler;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+import java.util.Optional;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
@@ -50,12 +50,15 @@ public class TextileBackup implements ModInitializer {
     public void onInitialize() {
         config = ConfigManager.loadConfig(ConfigHandler.class);
 
-        registerCommands();
+        Optional<String> errorMessage = config.sanitize();
+
+        if(errorMessage.isPresent()) {
+            LOGGER.fatal("TextileBackup config file has wrong settings! \n" + errorMessage.get());
+            System.exit(1);
+        }
 
         ServerTickEvents.END_SERVER_TICK.register(scheduler::tick);
-    }
 
-    private void registerCommands(){
         CommandRegistrationCallback.EVENT.register((dispatcher, dedicated) -> dispatcher.register(
                 LiteralArgumentBuilder.<ServerCommandSource>literal("backup")
                         .requires((ctx) -> {
@@ -64,7 +67,7 @@ public class TextileBackup implements ModInitializer {
                                                 ctx.hasPermissionLevel(config.permissionLevel)) &&
                                                 !config.playerBlacklist.contains(ctx.getEntityOrThrow().getEntityName())) ||
                                                 (ctx.getMinecraftServer().isSinglePlayer() &&
-                                                config.alwaysSingleplayerAllowed);
+                                                        config.alwaysSingleplayerAllowed);
                                     } catch (Exception ignored) { //Command was called from server console.
                                         return true;
                                     }