10 Ways to Archive Your Tweets
Here’s one:
2. Twapper Keeper: Archive Tweets Based on HashtagsTwapper Keeper is an online tool which archives tweets based on a given hashtag. Once you set up a query, Twapper Keeper will periodically scan Twitter for that tag and then archive the tweets it finds on its own servers. Tweets are scanned approximately every 5 minutes but that can vary based on the velocity of the incoming tweets. Once archived, you can then organize the tweets into categories of your choosing which show up on the right-hand side of the archived page.