@girish thank you for explaining. In my case it is easier to:
spin up my old server modify my (local) host file to point the dashboard domain to the old IP use the Cloudron web terminal to access MySQL and apply the fixes press the apps backup button and download to backup config afterwards revert host entries and import the apps backup config on my new CloudronThis way I am only using tools that are already shipped with Cloudron without the need of other software.