My friend and I made an Aternos minecraft server. But from the beginning he turned on cracked mode and we want to turn that off again so that minecraft is online again and we can see our skins without plug in. But if we set online mode true in the server settings, the server will delete everything we have built. How exactly can I undo it without losing the stuff that was built? LG Elina
You could save your built world as a folder, then activate the online mode and add the world again.
https://www.spigotmc.org/...-core.390/ could help you (in short, a world management system)
Your world including the buildings will be preserved, only your player data (position, inventory, etc.) will be reset. In cracked mode servers use a different player ID system and therefore can't find the old player data again after changing the setting.
The easiest way to solve this would be to put your items in a chest before changing the setting and write down your coordinates so that you can find them again later.