Often users need to migration their JCR repository from X to Y where this can be completely different databases (and types). Jackrabbit allows with their api to write simple ant tasks that loads up the entire repository in-memory using configuration A and then dump (100% copy) to another repository using configuration B (see blog http://blog.athico.com/2011/03/using-drools-ant-to-migrateback-up.html and video http://vimeo.com/21445110 for an example).

Would be great to have something similar in MS.