Migrating to SAP S/4HANA RISE is a strategic move that enables organizations to modernize their enterprise landscape. A greenfield migration means starting fresh with a new S/4HANA system rather than upgrading an existing SAP environment. This approach allows businesses to streamline processes, eliminate outdated customizations, and build a clean, efficient digital core.
However, greenfield does not mean legacy systems simply disappear. They present significant challenges after a greenfield migration. Although the critical data will be migrated to the new RISE environment, some older data will remain in these legacy applications. Organizations frequently struggle with data accessibility, as historical records remain vital for audits, reporting, and internal analysis. Compliance obligations add complexity because laws and industry regulations often require data to be retained for years, even if it is no longer in active use.
Older systems are often highly complex, with interdependent applications, custom code, and integrations that make decommissioning difficult without careful planning. Maintaining these systems also incurs ongoing costs for hardware, software licenses, and support personnel. Together, these factors make a thoughtful legacy system plan, including retirement of these applications, a critical part of any greenfield migration strategy.
Planning the Decommissioning Journey
Successfully retiring legacy systems requires a structured, methodical approach. The journey begins with a comprehensive assessment and inventory of all legacy applications, data, and integrations. This allows organizations to determine which data is essential, what can be archived, and which systems can be safely decommissioned.
Next, organizations should define a data retention strategy aligned with legal, regulatory, and business requirements. Clear retention policies ensure that only necessary data is preserved in accessible formats, reducing risk and storage costs. Historical data can then be consolidated, transformed, and archived securely using retirement tools.
Finally, the execution of decommissioning involves safely shutting down legacy systems after critical data has been moved to a new tool. This step often involves utilizing specialized decommissioning tools, allowing business users to continue retrieving historical information without relying on the legacy environment. Continuous governance and monitoring ensure that archived data remains compliant and accessible over time.
Legacy System Decommissioning Tool: Data GUARD
Data GUARD simplifies the decommissioning of legacy systems by automating the extraction, transformation, and secure storage of historical data. It enables organizations to identify and classify legacy information, enforce corporate retention policies consistently, and provide business users with controlled access, all without keeping the legacy environment live.
By consolidating data from SAP and non‑SAP systems into a single, compliant environment, Data GUARD creates a single source of truth that preserves necessary historical information while retiring outdated applications. Data GUARD provides a centralized view for managing and decommissioning multiple systems, supporting cloud, on‑premises, or hybrid deployments to fit existing infrastructure.
This allows organizations to streamline governance, ensure compliance with legal and regulatory requirements, and maintain audit-ready access to critical data without manual processes.
By reducing manual effort and risk, accelerating project timelines, and maintaining secure and accessible historical records, Data GUARD enables organizations to confidently retire legacy systems, reduce costs, and free IT teams to focus on optimizing their new S/4HANA environment.
Benefits of Thoughtful Legacy System Management
A strategic approach to legacy system decommissioning delivers tangible benefits.
- Cost savings are immediate, as organizations eliminate expenses related to hardware, software licenses, and ongoing maintenance. 71% of an organization’s IT budget is spent on maintaining and supporting outdated legacy systems, rather than investing in innovation and new technologies (KPMG, 2023).
- Risk mitigation is enhanced, as critical historical data remains secure, accessible, and compliant with retention requirements.
- Operational efficiency improves, reducing complexity and potential performance bottlenecks in the S/4HANA environment.
Beyond these operational advantages, thoughtful legacy management ensures a clean start for a greenfield migration. Organizations can focus on process optimization, data quality, and leveraging advanced S/4HANA features without the burden of legacy constraints. Controlled access to archived data maintains business continuity and audit readiness while enabling a more agile, modern IT landscape.
Case Study: Decommissioning 200 Legacy Applications
A global chemical company faced a complex legacy landscape, managing over 200 SAP and non-SAP systems that had accumulated over decades. While many of these applications were no longer actively used, the data within them remained for audit compliance and internal reporting. Simply shutting down these systems was not an option, as historical data still held significant value. The organization required a structured approach to retire legacy systems while preserving accessibility to critical information and reducing costs.
Auritas helped the company assess and prioritize legacy applications, evaluating systems based on usage, complexity, and retention requirements. Using a phased decommissioning approach, Auritas retired hundreds of systems, extracted and archived essential data in a consolidated location, and ensured secure, business-user-friendly access to historical information. The project resulted in significant cost savings through reduced licensing, infrastructure, and maintenance expenses, while establishing a compliant and consolidated legacy data environment that supports auditing, reporting, and future IT modernization initiatives.
A greenfield migration to S/4HANA RISE is an opportunity to reset and modernize enterprise operations, but legacy systems cannot be ignored. By proactively planning their decommissioning, defining clear retention strategies, and leveraging tools like Data GUARD, organizations can retire legacy environments safely, preserve essential data, and significantly reduce costs.tions can retire legacy environments safely, preserve essential data, and significantly reduce costs.
