Auto Saving Custom Forms

Hello,

I have a question in regards to implementing a feature for auto saving custom forms.

I'm currently developing a review system in which user's will be presented with a form of questions and they will have to provide answers. The form will have two options a save button and a submit button, which both will basically do the same thing. The Submit button will just add a finalize value to the DB insert query which won't let them edit their answers anymore.

The catch is that as they're entering their answers I want the form to auto save (post to the database) pretty regularly so that if they accidentally close the browser or something crashes they can come back and get to the exact same point.

I'm not really sure on how to go about this. I know that there is a module called 'Auto Save' which does this with nodes, but I'm developing custom dynamic forms which generate different content based on users and relationships so the forms vary for almost every user. I know that jquery will be involved, but once again I'm not sure where to start. If someone could just point me in the right direction I'm sure I could figure it out.

Thanks in advance for any help!