I'm looking for a solution to sync between a blog and a project or any other folder for that matter.

Alternatively, any other Mac app would help which allows to sync an xmlrpc.php with a folder.

The TextMate Blogging bundle works fine with fetch and post. But I can't find a way to sync. I tend to re-edit my blog posts, e.g. categories and formatting details. There's a good chance I lose some work, when I post the project file again rather than fetch + re-post.