Decision checklist
- Named business owner and active users/workflows
- Data ownership, retention, historical access and archive format
- Interfaces, hardware, reports, exports and configuration
- Replacement functionality and accepted gaps
- Parallel operation and representative acceptance tests
- Cutover backup and rollback criteria
- Archive ownership and tested retrieval
Decommission last
Disable old jobs and integrations in a controlled sequence; monitor the replacement; retain the old environment until acceptance and retention requirements are met. Record when licenses, servers and hardware may safely be removed.
See continuity planning, source-free replacement, business data recovery and the pillar.