How to reuse snapshots for Making recorded GHOST

Hi, Now I try to make a recorded Ghost, as tracing as the player moving and shooting before the world rewinded.

I already checked this article, then I know the snapshots could be exported and moved to an other object.

https://forum.unity.com/threads/chronos-time-control-unity-awards-winner.317688/#post-2092390

However, by this article, I can't understand how to export and keep snapshots when the world rewinding.

Could you tell me how to do so?