Downgrading PostgreSQL 10 to 9.4

Are there any particular precautions I should take when downgrading PG 10 to 9.4? I have a database on Heroku (PG 9.4) which I'm going to upgrade to PG 10.6. In case something goes wrong, I want to be able to go back to 9.4. Things I already tested: 1. create a backup of the already upgraded PG 10.6 DB (Heroku creates binary compressed dumps) 2. create a new PG 9.4 DB 3. upload the backup from step 1. to DB from step 2 The backup seems to be restored properly. What should focus on in particular to be sure this procedure is all right? Are there any other ways to downgrad PostgreSQL?