Posterous has just announced a backup tool for Posterous blogs. This online tool will export your entire Posterous space as HTML and include any photos and videos you have uploaded – all packaged up as a zip file.
When you visit the working area of any Posterous space, you’ll now notice a yellow Backup button in the top navigation bar. Click on it and you’re taken to the backup page where you’ll find a list of your Posterous spaces and a Request Backup button next to each one. Click it then enter the Captcha information and check that your email address is correct before submitting your backup request. When your backup is complete, you’ll receive an email message telling you it’s ready for download. Now, go back to the backup page and download your backup zip file. It’s that simple.