refactor: encapsulate startup logic and improve backup scheduling in index.js

download.js

@@ -0,0 +1,45 @@
+require('dotenv').config();
+const { 
+  downloadBackupFile, 
+  compressBackupFile, 
+  formatBytes, 
+  sendTelegramBroadcast 
+} = require('./index.js');
+
+async function downloadOnly() {
+  try {
+    console.log('Starting download process...');
+    
+    // Download backup file from SMB share
+    const localBackupFile = await downloadBackupFile();
+    console.log('Download completed:', localBackupFile);
+    
+    // Optionally compress the file
+    if (process.argv.includes('--compress')) {
+      const compressedFile = await compressBackupFile(localBackupFile);
+      console.log('Compression completed:', compressedFile);
+      
+      // Optionally send notification
+      if (process.argv.includes('--notify')) {
+        await sendTelegramBroadcast('all', `Backup downloaded and compressed ✅\nFile: ${compressedFile}`);
+      }
+    } else if (process.argv.includes('--notify')) {
+      await sendTelegramBroadcast('all', `Backup downloaded ✅\nFile: ${localBackupFile}`);
+    }
+    
+  } catch (error) {
+    console.error('Download failed:', error);
+    
+    // Optionally notify on error
+    if (process.argv.includes('--notify')) {
+      await sendTelegramBroadcast('errors', `Download failed 🔴\nError: ${error.message}`);
+    }
+  }
+}
+
+// Run if called directly
+if (require.main === module) {
+  downloadOnly();
+}
+
+module.exports = { downloadOnly };