My company moved to the cloud about a year ago and has implemented the sandbox capability. We used the sandbox initially to test our migration plans and cleanup steps before we went to production.
Now that we have been in production for a while, I have cleaned up duplicate fields and other data. However, when you copy data from production to the Sandbox, all the legacy data on that site remains. I don't get a clean copy from production to the Sandbox.
There are several articles on how to clean/reset a cloud site, which in most cases consists of deleting the site and recreating it.
We created a custom URL for our sandbox site and had to remove it due to issues with application data. It was a nightmare to recover the custom URL and to work with Atlassian for several weeks.
So the question is how to clean up or remove legacy data from a Sandbox site, or to make it an option as part of the Sandbox copy to create a clean sandbox site.