Depending on whether you need to reset a specific region (an arena) or an entire world, different plugins are recommended:
: Allows you to specify a source folder to load a world from and resets the active world to that original state upon command. [Bukkit][Plugin] PVP Map Reset
For Bukkit and Spigot servers focusing on PvP, "Map Reset" refers to a category of plugins and scripts designed to restore arenas or entire worlds to their original state after they have been damaged by TNT, fire, or player-placed blocks. These tools ensure that competitive environments remain fair and aesthetically consistent for every match without requiring a full server restart. Depending on whether you need to reset a