We released a new version of SimpleDB Explorer on Friday. This version includes a new command line executable, called SimpleDB Commander. You can use the commander app to export a SimpleDB Domain. It can be scheduled via Task Scheduler ot cron to automate the export.
You can find detailed listing on the release notes page ->
http://www.sdbexplorer.com/documentation/simpledb–simpledbexplorer-2009.02.html
Note [...]