[cutthegrass2]

- disable iCloud - disable any apps that sync via iCloud - backup phone to local machine and enable encryption (doesn't have to be macOS) - use something like PGP to re-encrypt the encrypted backup file generated - store encrypted backup file in a way that provides the durability guarantees you want

Boils down to, don't use iCloud - making the assumption that Germany and the rest of the EU countries aren't far behind the UK in authoritarianism and apple will remove ADP from those regions also.