How do I make an infinite build replace?

So Ive seen some maps where they have made infinite build reset. here is an example. so all the player built builds are destroyed but the builds placed by the creator are put restored the way it was when the sentry is eliminated. how do I do this?

Explosive Device paired with triggering Reset and Explode (Make sure you dont trigger reset and Explode at the same time or it wont work)

Make sure on Island Settings that Environment Damage is set to OFF or Player Built Only