I want to make my forge world back to vanilla

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    I made a vanilla world after some time i added some mods. But they started to glitch from my friends end so we got rid of them. Now i wanna make it back into vanilla but it says my world will get deleted. I backed up my world but my question is will it also get our builds back???

    No, backups save everything.

    The Aternos system only wants you to delete the world/reinstall the server if the software you want to install is known to be incompatible with the software you currently have installed.
    This is intended behavior to protect users from corrupting their server data.

    A workaround you can do the following to keep your world:
    - Stop your server
    - Download the world on the worlds page: https://support.aternos.org/hc…35711-Download-your-world
    - Switch the software
    - Upload the world again:     https://support.aternos.org/hc…0027235751-Upload-a-world

    Please note that Aternos has an upload limit, which is explained in the guide for the upload. If your world is larger than this limit you can't upload the world again.

    Also understand that doing this procedure is not recommended and that Aternos cannot provide any further support about it. Worlds which were used on a modded server can cause issues if you use it on a server with another software. This is also the reason why the system wants you to reinstall the server.