In 2020, the University of Georgia (UGA) Hargrett and Russell Libraries conducted a migration from Archivists’ Toolkit to ArchivesSpace, combining two different instances into one and conducting a year’s worth of data cleanup and management. This presentation will talk about UGA Hargrett and Russell Libraries’ migration from Archivists’ Toolkit to ArchivesSpace, specifically the iterative migration process, the various methods of data cleanup before and after the migration, and a brief introduction to the ArchivesSpace API.