Twitter is starting to roll out a new feature that allows you to download your entire history of Tweets.
If Twitter chose your account for this new backup feature you can find the Twitter download feature by clicking on the “Settings” link that’s found under the larger gear icon on your Twitter home page. Scroll to the bottom of your “Account” screen and, if available, you should see a giant “Request your archive” button under a new “Your Twitter Archive” section. It’s as easy as that.