This stuff is really useful even if you don't want to move off Heroku. Just knowing that you can is really reassuring in case they stop offering what you need. Simple how to guides are even better.

It was the fact that Heroku offer an environment to run fairly standard Rails + Postgres that made me pick them over the more unique and harder to move from Google platform. Even though I was starting from scratch.

It's always good to have an exit route.