To offer another perspective... I've migrated services to/from Now v2 (never used v1). While recently moving a Go service off (to a regular server) all that was changed was some bash that executed in a pre-deploy hook and the `now` command was swapped for a `scp`. `sed 's/package main/package handler/g'`. Of course, this is much simpler if the services are created with migration in mind.

I like to think of the builder options put in the `now.json` file as I would a webpack config.