I'm not the person you're responding to, but I believe I can answer that question as well.
Dokku essentially just started a container. If your server goes down, so did this container because it's just a single process, basically.
Other PaaS providers usually combine it with some sort of clustering like k3s or docker-swarm, this provides them with fail over and scaling capabilities (which dokku historically lacked). Haven't tried this k3s integration either myself, so can't talk about how it is nowadays.
Dokku essentially just started a container. If your server goes down, so did this container because it's just a single process, basically.
Other PaaS providers usually combine it with some sort of clustering like k3s or docker-swarm, this provides them with fail over and scaling capabilities (which dokku historically lacked). Haven't tried this k3s integration either myself, so can't talk about how it is nowadays.