7.9 to 18.3 upgrade

Hi all,

We are planning an upgrade from 7.9 to 18.3 and we have a question.

If we upgrade in this order 1. Dev, 2.Test and 3. Prod from 7.9 to 18.3 at some point we wont have an Production-like Environment for critical bugs.

As we would have a backup in dev (e.g. /appian79) could we:

1- Stop the upgraded 18.3 Environment in dev

2- Rename the appian79 old Environment to appian as it was originally

3- Start appian 79

Would that be enough to restore the backed up 7.9 Environment or would we Need to restore the database too?

Many thanks!