azharrkv
There is no straight forward configuration/set-up in Pega to Rollback the deployed code. But it can be achieved in below ways,

• Taking a database back-up before deployment and restoring the back-up if something fails.
• setting up point-in-time recovery for the database and restore it back to the preferred time if something fails.
• taking a snapshot/image of the server (clone) and revert back if something fails.
• deleting the versions deployed manually by unlocking it (not recommended).
• restricting the application to point the versions before deployment (not recommended).

Note: If your application runs in Pega cloud, then you might need Pega support to do the database back-ups. Pega also has an automatic back-up everyday which can be confirmed with your platform owner.