Please note that migration available just with the paid membership and not for the trial period.
The website migration process in WordWPressPlugins is fully automated and takes only one click. Copy of your existing website will be created on WordWPressPlugins in minutes. After you will need just point DNS to WordWPressPlugins. If you encounter any problems – contact us, we’ll fix it for you within a daily timeframe.
As for your original site – it will not ever go down.