Use SMS Backup. Just found it last night after a friend suggested it, and it works great. It backs up your texts by contact and into a folder on your Gmail. So you can view it there as a conversation as well. Just thought I'd share because I have interesting conversations with a lot of my friends back at school and it's always a good laugh to look over them. You guys may have other reasons to backup, but this is, by far, the best app I have used. By the way, this is all done wireless so no need to connect to your PC and transfer anything.