When you are working with Author-it Cloud Migration Toolkit you should use a copy of your database for your migration.
Using the copy, you can make changes to objects and paths used by your database without affecting your users. By using a copy of your database you also enable your users to continue to working right up to the time you are ready to go live.
For your actual migration you should also use a copy of your database. When you run Author-it Cloud Migration Toolkit you will see a reminder: