diff --git a/index.js b/index.js
index aac493c..8795c42 100644
--- a/index.js
+++ b/index.js
@@ -4,6 +4,8 @@ const sql = require('mssql');
 const { S3Client, PutObjectCommand, ListObjectsV2Command } = require('@aws-sdk/client-s3');
 const fs = require('fs');
 const path = require('path');
+const zlib = require('zlib');
+const { pipeline } = require('stream/promises');
 const SambaClient = require('samba-client');
 
 // AWS S3 Configuration (v3 client)
@@ -138,7 +140,7 @@ async function createDatabaseBackup() {
     const backupQuery = `
       BACKUP DATABASE [${process.env.MSSQL_DATABASE}] 
       TO DISK = N'${backupFilePath}' 
-      WITH NOFORMAT, INIT, NAME = N'${process.env.MSSQL_DATABASE}-Vollständig Datenbank Sichern', 
+      WITH FORMAT, INIT, NAME = N'${process.env.MSSQL_DATABASE}-Vollständig Datenbank Sichern', 
       SKIP, NOREWIND, NOUNLOAD, STATS = 10
     `;
 
@@ -170,6 +172,27 @@ async function downloadBackupFile() {
   }
 }
 
+// Function to compress backup file with gzip
+async function compressBackupFile(inputPath) {
+  try {
+    console.log('Compressing backup file...');
+    
+    const outputPath = inputPath + '.gz';
+    const readStream = fs.createReadStream(inputPath);
+    const writeStream = fs.createWriteStream(outputPath);
+    const gzipStream = zlib.createGzip();
+    
+    // Use pipeline for better error handling and cleanup
+    await pipeline(readStream, gzipStream, writeStream);
+    
+    console.log('Backup file compressed successfully:', outputPath);
+    return outputPath;
+  } catch (err) {
+    console.error('Error compressing backup file:', err);
+    throw err;
+  }
+}
+
 // Function to upload backup to S3
 async function uploadBackupToS3(filePath) {
   try {
@@ -184,12 +207,14 @@ async function uploadBackupToS3(filePath) {
       throw err;
     });
     
-    // Create S3 upload parameters using stream
-    const key = `backups/${process.env.MSSQL_DATABASE}_${new Date().toISOString().replace(/[:.]/g, '-')}.bak`;
+    // Create S3 upload parameters using stream - add .gz extension to key
+    const key = `backups/${process.env.MSSQL_DATABASE}_${new Date().toISOString().replace(/[:.]/g, '-')}.bak.gz`;
     const params = {
       Bucket: process.env.S3_BUCKET_NAME,
       Key: key,
-      Body: fileStream
+      Body: fileStream,
+      ContentEncoding: 'gzip',
+      ContentType: 'application/gzip'
     };
     
     // Upload file to S3 using v3 client
@@ -241,20 +266,37 @@ async function runBackupProcess() {
     // Download backup file from SMB share
     const localBackupFile = await downloadBackupFile();
 
-    // Upload backup to S3
-    const s3Url = await uploadBackupToS3(localBackupFile);
+    // Compress backup file with gzip
+    const compressedBackupFile = await compressBackupFile(localBackupFile);
+
+    // Upload compressed backup to S3
+    const s3Url = await uploadBackupToS3(compressedBackupFile);
+
+    // Clean up temporary files
+    try {
+      if (fs.existsSync(localBackupFile)) {
+        fs.unlinkSync(localBackupFile);
+        console.log('Cleaned up original backup file:', localBackupFile);
+      }
+      if (fs.existsSync(compressedBackupFile)) {
+        fs.unlinkSync(compressedBackupFile);
+        console.log('Cleaned up compressed backup file:', compressedBackupFile);
+      }
+    } catch (cleanupErr) {
+      console.warn('Error cleaning up temporary files:', cleanupErr.message);
+    }
 
     console.log('Backup process completed successfully at', new Date().toISOString());
     console.log('Backup available at:', s3Url);
 
     // Notify admins via Telegram broadcast with size
-    const fileName = path.basename(localBackupFile || 'backup.bak');
+    const fileName = path.basename(compressedBackupFile || 'backup.bak.gz');
     const when = new Date().toISOString();
     const sizeLine = sizes && (sizes.dataBytes != null || sizes.logBytes != null)
       ? `\nDB Size: ${sizes.dataBytes != null ? formatBytes(sizes.dataBytes) : '?'} (data), ${sizes.logBytes != null ? formatBytes(sizes.logBytes) : '?'} (log)`
       : '';
     const msg = `Backup completed ✅\nDB: ${process.env.MSSQL_DATABASE}\nFile: ${fileName}\nS3: ${s3Url}${sizeLine}\nTime: ${when}`;
-    await sendTelegramBroadcast('admins', msg);
+    await sendTelegramBroadcast('all', msg);
   } catch (err) {
     console.error('Backup process failed:', err);
     // Ensure connection closed on failure
@@ -304,7 +346,7 @@ console.log('Database backup service started. Running backups every 24 hours.');
     const host = require('os').hostname();
     const region = process.env.AWS_REGION || 'n/a';
     const bucket = process.env.S3_BUCKET_NAME || 'n/a';
-    await sendTelegramBroadcast('admins', `Backup service started ✅\nDB: ${process.env.MSSQL_DATABASE}\nHost: ${host}\nAWS: ${region}/${bucket}\nTime: ${when}`);
+    await sendTelegramBroadcast('all', `Backup service started ✅\nDB: ${process.env.MSSQL_DATABASE}\nHost: ${host}\nAWS: ${region}/${bucket}\nTime: ${when}`);
   } catch (e) {
     console.warn('Startup broadcast failed:', e.message);
   }