Loading Copied Saves or Restored Backups Without Entity Crashes

Why Backup and Copied Saves Fail

When you copy world files, restore an older backup, or merge edited world regions, duplicate entity identifiers often appear in the save data. Vanilla Minecraft can choke on these matching IDs, leading to failed world loads, severe lag spikes, or server crashes before the world can fully start.

Resolving ID Conflicts Automatically

DEUF operates completely automatically to prevent these loading failures without requiring any player commands or interface interactions:

1. Place your copied save or restored backup folder into your saves directory (or the root directory of your dedicated server).

2. Launch Minecraft with the mod installed and select your world from the menu.

3. During the initial chunk and entity loading phase, the mod scans incoming entities for conflicting identifiers.

4. When a duplicate identifier is detected, the mod immediately intervenes, assigns a brand-new unique ID to the conflicting entity, and finishes loading the world.

Because the mod resolves the identifier conflict instantly upon reading the save data, your world loads cleanly without getting stuck on corrupted entity tables or crashing back to the launcher.