I recently came across a handy utility on Codeplex called Windows Live Writer Backup (WLWBackup). WLWBackup is a backup utility for Windows Live Writer. It backs up blog settings, posts and plugins.
This tool is useful if you plan to change your machine and need to take a back up of your Live Writer. You need .NET 3.5 SP1 on this machine.
Download the Windows Live Writer Backup version 3.0