Hey @nitesh047 ! 
Here's what you're looking for:
[Offline Enketo Forms]
Enketo supports offline form filling - you can simply bookmark the offline page. It also lets you save drafts, and once you're back online, submissions are automatically sent to the server. Also, the offline submissions can be saved as .zip of .xml files if required. Meanwhile, you may close the browser / system as well because everything is stored in the browser's cache.
Hope that helps! Have a great day! 