For the saved text messages, you can forward your text message to pc via email.Instead of putting in a phone number in the "To:" portion of the text, just insert your e-mail address exactly how you would in an e-mail. From there you can save it to your computer. For future SMS messages you can download Handcent SMS from Android Market.Handcent SMS is a powerful free sms/mms tools for your android phone. Backup Security powered by the Handcent network allows you to backup all your Handcent’s settings, SMS messages and MMS messages to your My Handcent Online account and restore them if you reinstall Handcent or if you reset your device or upgrade to a new one.
Hope this helps
Check out a fun infographic that teaches you how to increase storage, enhance security, improve battery life and clean your device.