4. Data restoration remarks

When restoring data from an sql backup from another platform it is safe to do that as the currently used encryption_key (inside my.cnf) is not affected this way.
When copying constants.yml file from another platform and the encryption is enabled, the current mysql.encryption.key (inside constants.yml) must be restored in constants.yml to the same one the MariaDB server is originally started with or it will fail to start otherwise after ngcpcfg apply.