Periodically autosave form

Question

How to implement a periodical save of a form in the background? Same kinda thing that gmail does.

Answer 1

Sisyphus.js: Gmail-like client-side drafts and bit more. Plugin developed to save html forms data to LocalStorage to restore them after browser crashes, tabs closings and other disasters. http://sisyphus-js.herokuapp.com

Smashing Magazine article: http://coding.smashingmagazine.com/2011/12/05/sisyphus-js-client-side-drafts-and-more/