GPO Storage and Replication
GPOs are stored in both the file system and the Active Directory database. Each domain in an Active Directory forest stores a complete copy of that particular domain’s GPOs.
Within Active Directory, the GPO links and version information are stored within the domain naming context partition of the database. Because this partition is replicated only within a single domain, processing GPOs linked across domains, either using sites or just a cross-domain GPO link, can take longer to load and process.
The GPO settings are stored in the file system of all domain controllers within the SYSVOL folder. The SYSVOL folder is shared on all domain controllers. Each domain GPO has a corresponding folder located within the Sysvol\Companyabc.com\Policies ...