set backup for all

app/UI/VmCreate/Sections/AdditionalDiskSection.php

@@ -42,6 +42,7 @@ class AdditionalDiskSection extends BaseSection implements ClientArea
         {
             $field = new Switcher('additionalDiskBackup');
             $field->replaceClasses(['lu-form-check lu-m-b-2x']);
+            $field->setDefaultValue('on');
             $this->addField($field);
         }
         //bus