If a service one once used is retired, open sourcing it is of course the very best outcome. Thanks for that!!! However (regarding AppEngine based solutions), a

If a service one once used is retired, open sourcing it is of course the very best outcome. Thanks for that!!! However (regarding AppEngine based solutions), as far as I know, if AppEngine goes down, there is no way to have any backup, is it? Only google can host AppEngine apps.