Chunk Back

A Minecraft Forge 1.20.1 mod for saving and restoring chunk regions without lagging the server.

What it adds

Chunk Back lets server operators save snapshots of chunk regions and restore them later without causing lag spikes or consuming RAM during normal gameplay. It uses RLE voxel compression to store snapshots on disk.

Commands

All commands require operator permission level 2.

Command	Description
/chunkback save <name> [radius]	Save chunks around you (default radius: 4)
/chunkback savearea <name> <x1> <z1> <x2> <z2>	Save a specific chunk range
/chunkback restore <name>	Restore snapshot to saved state
/chunkback list	Show all saved snapshots
/chunkback delete <name>	Remove a snapshot
/chunkback info <name>	Show snapshot details

Important Notes

• Snapshots are stored per-world in the server's config directory
• Restoring a snapshot overwrites existing blocks in the region
• Large restores may take several ticks to complete; the server remains playable throughout