A cloud-based identity and access management service for securing user authentication and resource access
Hi @Peraza, Omar , If the identities are different then the objects from onprem would sync over and create new identities in Azure and the existing accounts in Azure would continue to stay there. However if the identities are similar (matching UPN, Proxy address, etc.) then you may see that the accounts being synced from Onprem AD have merged with the accounts in Azure. Refer https://learn.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-install-existing-tenant
When you enable staging mode, the identities from Onprem AD & Azure AD would be imported to AD connect and synced but they will not be exported to either Azure or Onprem AD. Staging server is recommended for disaster recovery situations. Refer https://learn.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-sync-staging-server