FlowingTime backwards by present space should be very difficult to break through...
Because now present space concept of time is Pass, now, and future.
It is not easy to break this law. We have never seen either at present future person got back to in the past to come modernly.
If I can sit time machine to go back 3 years.
I will want to be there to see my girlfirend and pay more attentions to her in the past.
Even although the entity is unable to get back, only memory can.
Memory seems can take me back to the happy time as we are together....
Let the past pass, and would make life more actual.