I could re-deploy a heroku app on my typical stack (ruby, rails, postgres) to digital ocean or similar in a couple of hours. Most of that would just be setting

I could re-deploy a heroku app on my typical stack (ruby, rails, postgres) to digital ocean or similar in a couple of hours. Most of that would just be setting up the new one and migrating the data across. You don't have to significantly alter apps (in that stack) to be heroku-compatible.