With apologies for the necropost, I’m looking at exactly this question at the moment. My thinking is you could possibly pair FOG with Relax-and-Recover or SystemImager for a complete backup/image/bare metal restore solution.
Looks like you would be able to add a Relax-and-Recover (ReaR) menu item to FOG’s menu for a full network-based restore, in the event of disaster. Since FOG can be used as a scheduler and general-purpose task executer, it is entirely possible to run one of these open source “live backup” solutions alongside FOG - i.e. on the same server.
I also note that ReaR can deal with UEFI/MD RAID situations, which seems to be a rare gift. 🙂