The current FME Server backup/restore process is very handy but a bit misleading in that a restore behaves more like a deploy than a true restore. What I mean by this is that if you make a backup, then add some new items to FME Server (e.g. workspaces, resources, etc.), then restore the backup, you will be left with a hybrid configuration - those items which were backed up will be reverted to their previous state but the new items will also still exist on the server.
Every other backup system that I know of restores to a known state, not to a mixed state of pre- and post-backup items. It would be great if FME Server could also follow this model, or at least provide an option for this more conventional behavior.