If you are planning on cleaning up your data, we recommend that you do so, but it is not a requirement. If anything, you may clean up the data after the migration, which would lend itself to further training opportunities in Blackbaud Grantmaking (GIFTS Online). If you are uncertain how to clean your data or what you are specifically looking to clean up, we would advise holding off to make sure the migration to Blackbaud Grantmaking is as smooth as possible.