This is how Erlang (for example) gets its reputation of being "nine-nines" capable (i.e. capable of 99.9999999% uptime, or downtime on the order of milliseconds per year). Erlang (and Elixir and LFE) software following the OTP framework is usually ordered into "supervision trees" - layer upon layer of Erlang processes managing other Erlang processes in turn managing other Erlang processes, all potentially distributed across multiple Erlang VM (nowadays BEAM) instances.