Hi There,
Adding on what Dirk said - the GMU is exporting only 'active' policies/services.
Come to think about it, not all policies/services would have same revisions if any.
So if the need is for a specific policy revision to be exported (or some specific ones) - the fastest solution would be to set them as active for the migration out (and then revert to the latest ones) or to manually export them and import into the target hosts.
With that said- it is a nice IDEA to have and possibly by adding an option to migrate out by specific text in the comment field it would be more handy.
Hope this helps.
Kind Regards,
Amit.