Creating a private members form that retains information after logoff

Struggling to describe this but will give it a go.

I have a standing site. I want to sell a product on the site and when the sale completes the user will get access to a login. The login will have a form behind it with questions they can answer in long format.

I want them to be able to login and complete the questions, but if they get bored midway through they can save and logout to log back in later and their previous content will be there.

It would be even better if I could enable this to be complete multimodal between this option and perhaps sending the questions as aone by one email.

Is there a plugin that could help with this?


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