If you're taking an instantaneous snapshot of the system then yes. A standard copy/rsync/etc. isn't going to give you that. If the copy takes a long time at wha

If you're taking an instantaneous snapshot of the system then yes. A standard copy/rsync/etc. isn't going to give you that. If the copy takes a long time at what point do you grab the pg_xlog directory? and are all the files there that you need/ed?