The role responsible for protecting models that go on to become part of the future 'As Is' support for the delivered solution is the Solution Developer. The Solution Developer ensures that the technical models, including system architectures and detailed design documents, are preserved and maintained. These models are crucial for ongoing support and future enhancements. The Agile BA supports this by providing clear and well-documented requirements and analysis that feed into these models, but the responsibility for their protection and maintenance lies primarily with the Solution Developer.

Reference: Business Analysis.pdf, Chapter 13, Delivering the Requirements