Myself, I see no need for services like this, but then I am one who sees no great benefit in having backups of my tweets. I am sure there are quite a few of you who would love a service like this. So here are five (5) sites that will backup your tweets.

A.  BackupMyTweets : A free service that lets you backup your tweets in a single click. Just login with your Twitter account and this site will do rest of the work.

B.  LifeStreamBackup : An online backup service that will not only backup your Tweets but also support backup of Photobucket, Google docs, Delicious and Wordpress.

C.  TweetAke : Tweetake is here to allow you to back-up your followers, people you are following and Tweets with just one click.

D. TweetScan : It takes backup of your last 1000 messages from Twitter and combine with results from their historical database. Tweet Scan can also retain your tweets to improve later backups.

E. TweetBackup : Allows you to take backup of your tweets and save it as HTML or in simple txt file.