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Yes, you need to give each user their own copy. Sharing a single file is just asking for trouble. Apart from the types of error messages you're getting you also risk data corruption. Is there a reason not to give each user their own copy? If it's a question of updates, you can easily handle...

Saving HTML in a larger project with many moving parts takes a little more work. You'll need to organize the file system and keep track of which HTML was parse, where the parsed data goes, and if the page needs to be re-scraped for updates.