DubTrub,
I do not know of any easy way to autosave your posts on your computer, but you could use this link:
DubTrub Post Results
And Manually back them up. (From there you can use View Source to make an HTML Link page too.)
You might want to send an email to the admin to see if they have any database retrieval options to pull up all your posts in their entirety, so you can back them up from time to time.
Take Care,
Richard