Can I exclude users, so on import the users on the live site don't get overwritten by users in the backup?

As a developer who migrates large sites, I want the migration to be capable of running in the background so the migration can continue even if my browser is closed or my network connection is interrupted.

In order to deploy from Staging to Production during low traffic times, it would be incredibly helpful if there was a feature to set a time for the copy/deployment to occur.