enable backupswitcher by default

app/UI/Disk/Forms/UpdateForm.php

@@ -56,7 +56,6 @@ class UpdateForm extends BaseForm implements ClientArea
         $backupSwitcher = $this->getField('backup');
         if ( parent::getFormData()['id'] == 'scsi0') {
             $backupSwitcher->addHtmlAttribute(':disabled', true);
-            $backupSwitcher->setValue('on');
         }
 
     }

app/UI/Disk/Providers/DiskProvider.php

@@ -140,7 +140,7 @@ class DiskProvider extends BaseDataProvider implements ClientArea
         }
         $vmModel->save();
         //backup
-        $backup = $this->formData['backup'] == "on" ? null : 0;
+        $backup = $this->formData['backup'] == "on" ? 1 : 0;
         $hdd->setBackup($backup)->update();
 /* thurdata no auto reboot
         if ($vm->isRunning() &&