When you start going backwards you probably won’t be starting from idle. You will need a special node connected to the “Entry” node. The special node would connect to all the other nodes in the graph so they can all potentially be the initial state. At least, that’s what I figure.
I don’t know much about sequencer. I know it can record in real time. I think it records actors as tracks like in a midi file. I don’t know if it records the anim graph, transitions and all, but it should at least record the bones’ locations. Otherwise it couldn’t handle everything it does.
The link is on the Epic website so I’m not sure why it would fail. You can find it with a search for “Sequencer Hellblade”. Again tho, no guarantees on this. Maybe if you figure it out you can let me know. 