If it were me, I would use negentropy sync, this is how I migrate from server to server. I setup a stream, and then I run a sync at the same time. Once it completes, the relay is updated in realtime to the latest. Also is really nice to resume any transfers, if something fails in the middle you can just re-run the sync.

I haven't had a chance to play with orly as much as I wanted to. But, this is what I would try to mimic is these sysadmin tasks with orly in the mix. If orly itself can't do the sync, might be worth firing up a strfry locally there too (streaming to it or dumping into it) and then use it to push the sync. I have tested streaming from strfry to orly, but not in the reverse.. Streaming is easy though, but could miss events. Negentropy does not miss.

Let me know how it goes!