Mount-SPContentDatabase rollback after upgrade

Question

We need to move/use a content database from old to new web application. Scenario goes like:

1. Detach content database from Old Web Application with Windows Classic Authentication mode
2. Attach content database to New Web Application with Claims Based Authentication mode

Question: Is it possible to roll it back through Attach Content Database (in Central Admin) or Mount-SPContentDatabase (PowerShell) or is it like a one-way ticket?

I had to ask this here because the DEV & PROD Web Application setup is not alike.

Answer 1

Only when you (re)run Convert-SPWebApplication will this be permanent -- unless it came from another farm with either a different version of SharePoint or lower patch level on the same version of SharePoint.

Make a SQL backup first!