msdeploy and backup of application

Hi 

I am trying to get msdeploy to backup an application using the IIS automatic backups.

It backups up websites fine but it won't backup applications within the website. In fact it just makes an additional backup of the parent site.

I'm using msdeploy.exe -verb:sync -source:backupManager -dest:backupManager=www.website.com/api

In the case above I get two backups, one of www.website.comand another of www.website.com when in fact I want a backup ofwww.website.com/api only.

I've spent the day googling and can't seem to find a solution.

Thanks

Carl