diff --git a/SynologyCertificateExporter/Services/CertificateExporter.cs b/SynologyCertificateExporter/Services/CertificateExporter.cs
index 81e7d2d..658f9a3 100644
--- a/SynologyCertificateExporter/Services/CertificateExporter.cs
+++ b/SynologyCertificateExporter/Services/CertificateExporter.cs
@@ -43,8 +43,27 @@ namespace SynologyCertificateExporter.Services
                     var cpFrom = _synoDirectory + "/" + certificate.Name + "/" + fileName;
                     var cpTo = exportDirectory + "/" + fileName;
 
-                    Console.WriteLine($"Copy file from {cpFrom} to {cpTo}");
-                    File.Copy(cpFrom, cpTo);
+                    if (File.Exists(cpTo))
+                    {
+                        var cpFromFileInfo = new FileInfo(cpFrom);
+                        var cpToFileInfo = new FileInfo(cpTo);
+
+                        if (cpFromFileInfo.CreationTime != cpToFileInfo.CreationTime)
+                        {
+                            Console.WriteLine($"Copy file from {cpFrom} to {cpTo} with overwrite because creationtime changed");
+
+                            File.Copy(cpFrom, cpTo, true);
+                        }
+                        else
+                        {
+                            Console.WriteLine($"Skipping copy from {cpFrom} to {cpTo}");
+                        }
+                    }
+                    else
+                    {
+                        Console.WriteLine($"Copy file from {cpFrom} to {cpTo}");
+                        File.Copy(cpFrom, cpTo);
+                    }
                 }
             }
         }