diff --git a/build/jenkins/GDriveUpload b/build/jenkins/GDriveUpload
index 9301298..eb0b39d 100644
--- a/build/jenkins/GDriveUpload
+++ b/build/jenkins/GDriveUpload
@@ -17,17 +17,36 @@ pipeline {
                     echo "Target Google Drive folder: ${env.GOOGLE_DRIVE_FOLDER}"
                     dir("${params.buildPath}") {
                         def zipFilename = readFile('created_zip.txt').trim()
+
                         if (!fileExists(zipFilename)) {
                             error "Zip file '${zipFilename}' not found in ${params.buildPath}"
                         }
 
-                        echo "Uploading '${zipFilename}' to Google Drive folder '${env.GOOGLE_DRIVE_FOLDER}'..."
+                        // Check if file already exists on Google Drive
+                        def alreadyExists = powershell(script: """
+                            \$result = rclone ls remote:\"${env.GOOGLE_DRIVE_FOLDER}\" | Select-String "${zipFilename}"
+                            if (\$result) { return 1 } else { return 0 }
+                        """, returnStatus: true) == 1
 
-                        // Add actual upload logic here (e.g., gsutil, rclone, or API)
-                        // Example (placeholder):
+                        if (alreadyExists) {
+                            echo "Zip file '${zipFilename}' already exists on Google Drive. Skipping upload."
+                        } else {
+                            echo "Uploading '${zipFilename}' to Google Drive folder '${env.GOOGLE_DRIVE_FOLDER}'..."
+                            powershell """
+                                rclone copy \"${zipFilename}\" remote:\"${env.GOOGLE_DRIVE_FOLDER}\"
+                            """
+                        }
+
+                        // Retention logic – keep only latest 5 ZIPs
+                        echo "Cleaning up old ZIP files in Google Drive..."
                         powershell """
-                            echo Uploading ${zipFilename} to Google Drive...
-                            rclone copy \"${zipFilename}\" remote:\"${env.GOOGLE_DRIVE_FOLDER}\"
+                            \$files = rclone lsf --files-only --format "t" --max-age 365d remote:\"${env.GOOGLE_DRIVE_FOLDER}\" | Sort-Object | Where-Object { \$_ -like "*.zip" }
+                            if (\$files.Count -gt 5) {
+                                \$filesToDelete = \$files | Select-Object -First (\$files.Count - 5)
+                                foreach (\$file in \$filesToDelete) {
+                                    rclone delete remote:\"${env.GOOGLE_DRIVE_FOLDER}/\$file\"
+                                }
+                            }
                         """
                     }
                 }