Hardcore Map Reset Mod 1.8, 1.7.10, 1.7.2 adds a new folder in the minecraft directory called "maps" which the modpack dev can put backups of the map or maps in. When the player dies and has to restart the map they can click the Rest maps button on the select world screen.

How to use:

• Copy all of your maps that you want into the maps folder.
• When you are ready to reset your world click the reset world button.