diff --git a/addDroplet.go b/addDroplet.go
index 1d95510..d9912c9 100644
--- a/addDroplet.go
+++ b/addDroplet.go
@@ -251,14 +251,14 @@ func updateNetwork(d *DropletT, domcfg *libvirtxml.Domain) bool {
 }
 
 /* from vm3-with-nvme-1.5GB-sec.xml
-    <disk type='block' device='disk'>
-      <driver name='qemu' type='raw'/>
-      <source dev='/dev/nvme4n1'/>
-      <backingStore/>
-      <target dev='vdb' bus='virtio'/>
-      <alias name='virtio-disk1'/>
-      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
-    </disk>
+   <disk type='block' device='disk'>
+     <driver name='qemu' type='raw'/>
+     <source dev='/dev/nvme4n1'/>
+     <backingStore/>
+     <target dev='vdb' bus='virtio'/>
+     <alias name='virtio-disk1'/>
+     <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
+   </disk>
 */
 
 // returns false if something went wrong
diff --git a/configfiles.go b/configfiles.go
index 5c2b0f6..4ea72e0 100644
--- a/configfiles.go
+++ b/configfiles.go
@@ -84,16 +84,37 @@ func readConfigFile(filename string) error {
 }
 
 func writeConfigFile() {
+	test := time.Now().Format("YYYYMMDD-HH-MM")
+	if !writeConfigFileTmp("virtigo.json.new." + test) {
+		log.Println("config file write error")
+		os.Exit(-1)
+	}
+	if !writeConfigFileTmp("virtigo.json") {
+		log.Println("config file write error")
+		os.Exit(-1)
+	}
+
+	origname := filepath.Join(os.Getenv("VIRTIGO_HOME"), "virtigo.json")
+	newname := filepath.Join(os.Getenv("VIRTIGO_HOME"), "virtigo.json.old")
+	err := os.Rename(origname, newname)
+	if err != nil {
+		log.Printf("rename fail: %s", err)
+		os.Exit(-1)
+	}
+}
+
+func writeConfigFileTmp(filename string) bool {
 	fullname := filepath.Join(os.Getenv("VIRTIGO_HOME"), "virtigo.json")
 	cfgfile, err := os.OpenFile(fullname, os.O_RDWR|os.O_CREATE, 0666)
 	defer cfgfile.Close()
 	if err != nil {
 		log.Info("open config file :", err)
-		return
+		return false
 	}
 	json := me.cluster.FormatJSON()
 	fmt.Fprintln(cfgfile, json)
 	log.Info("Write:", fullname, "OK")
+	return true
 }
 
 func writeConfigFileDroplets() {
diff --git a/xml.go b/xml.go
index 03aad82..b100b14 100644
--- a/xml.go
+++ b/xml.go
@@ -328,7 +328,13 @@ func dumpNonStandardXML(domcfg *libvirtxml.Domain) {
 			domcfg.CPU = nil
 		case "host-model":
 			domcfg.CPU = nil
+		case "custom":
+			fmt.Printf("? CPU: %+v\n", domcfg.CPU)
+			fmt.Printf("? CPU Model: %+v\n", domcfg.CPU.Model)
+			domcfg.CPU = nil
 		default:
+			fmt.Printf("? CPU: %+v\n", domcfg.CPU)
+			fmt.Printf("? CPU Model: %+v\n", domcfg.CPU.Model)
 			fmt.Printf("? CPU Mode: %+v\n", domcfg.CPU.Mode)
 		}
 	}
@@ -518,8 +524,10 @@ func dumpNonStandardXML(domcfg *libvirtxml.Domain) {
 		domcfg.Devices.Emulator = ""
 	case "/usr/bin/kvm":
 		domcfg.Devices.Emulator = ""
+	case "/usr/bin/kvm-spice":
+		domcfg.Devices.Emulator = ""
 	default:
-		fmt.Printf("Unknown Emulator: %s\n",  domcfg.Devices.Emulator)
+		fmt.Printf("Unknown Emulator: %s\n", domcfg.Devices.Emulator)
 	}
 
 	// ignore Channels == SpiceVMC