no problem ahah --fork/--clone approach and make overwriting (even more) explicit.--minutes-ago=15m or similar to avoid you having to deal with Unix timestamps.
--clone/--fork --clone=new-nameNow, you clone it out for initial data. You run things for a while and then you want to revert. Now you have to go and change where each of those things point to (by cloning the "backup" to a separate thing, because otherwise you loose it).