This is as great example of how you can test the market when you have an idea before you sink too much into the setup. Single launch page, a price, "contact us" just goes to a regular email.
If every website had a 'contact us' button that just goes to email the world would be a better place.
Useful, but are there any risks that accidentally including some dubious information might get your Google account suspended, including all its data? How do you make backups?
I don't understand the concern or why backups would be necessary. My understanding is that customers create their design as a spreadsheet (possibly using Google Sheets) and then simply pass that off to a designer to be converted into a Web design (presumably CSS/HTML?) I don't see why account suspension or backups are relevant here.
Google without any prior warning can just block your account for some reason, like violation of TOS. While it's seems to be unlikely for casual user, but must be considered.