Assume the existing database is called postgresql-horizontal-343434.
heroku login
heroku addons:create -a bc-court-reminders heroku-postgresql:standard-0
This will create a new database instance, for example postgresql-triangular-121212.
heroku pg:wait -a bc-court-reminders
heroku maintenance:on -a bc-court-reminders
heroku pg:copy -a bc-court-reminders postgresql-horizontal-343434 postgresql-triangular-121212
heroku pg:promote -a bc-court-reminders postgresql-triangular-121212
<UPDATE ALL THE ENVIRONMENT VARIABLES>
heroku maintenance:off -a bc-court-reminders
heroku addons:destroy -a bc-court-reminders-dev postgresql-horizontal-343434
Then set up daily backups:
heroku pg:backups:schedule -a bc-court-reminders --at '03:00 America/New_York'
heroku pg:backups -a bc-court-reminders