Store large files for offline access in web application

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I have a requirement where the web application needs to store about 2 GB of files of various formats .htm, .pptx,.docx, etc. for offline access.

What is the best approach to implement this requirement in HTML5 ?

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If you want to make sites (like html pages, images, resources, etc.) offline available just create a manifest file and declare your server-delivered files to be locally cached. If you'd like to storage data for these sites offline use localStorage therefore.

But I assume that 2 GB is way to big -- most browsers are configured to take something about 5 MB. If the website is for internal use only you may change browser preferences therefore; but for public websites this may be a major issue.