@Pavlo thanks for the clarification.
Good to know that we have some time to fix it, alerts and that the system will be restored in the worst case scenario.
I also understand that the system backup today is up to Blynk servers and is not in ours hands (although I cannot measure today the risks of loosing a template or a customer setup for other reasons).
Sorry for these questions, like I said, some risks have to be taken into consideration when you start to rely in a partnership and consider it as part of your business model.
The yearly payment in our case should be fine and well managed.