Backing Up the Island and Playing Co-op on LAN

Saving a Clean Backup Copy

Unlike standard random seeds, a custom survival island relies on handcrafted terrain that you cannot simply recreate from the Create New World menu if something goes wrong. Before you start digging mines, clearing forests, or risking creeper explosions around your base, make a clean backup of the untouched world. From the Singleplayer menu, click once on the Custom Survival Island 1 entry without entering the world, then click Edit at the bottom of the screen. Select Make Backup so Minecraft stores a zipped snapshot in your backups folder that you can restore anytime you want a fresh start.

Playing Co-op on Your Local Network

The giant island has plenty of space and basic survival resources to support multiple players building together. To invite others on your local network, load into the map and press Esc to open the pause menu. Click Open to LAN, set Game Mode to Survival, and leave Cheats turned off if you want everyone to start with empty pockets and gather materials normally. Click Start LAN World and share the port number shown in chat so friends on the same network can join through their Multiplayer menu.