Backing up large worlds (500+ MB) causes the game to stop responding

When creating a backup of a world, if that world is sufficiently large, the game will stop responding during the backup process.

To reproduce

1. Generate a world
2. Generate a very large amount of chunks in that world, enough that the world's backup size is around 400 to 500 MB or higher
3. In the world selection screen, choose that world, select EDIT, and select BACKUP.
   → The game will stop responding, or "hang", until the backup is finished.