This paper presents a model for the preservation of digital evidence in criminal research institutions. The objective of the model is to include features for the admissibility of evidence in court and provide support to fulfil the legal requirements and performance of this sector. In addition to the model, there is an implementation guide, which includes an implementation plan, development plan, and evaluation plan. This is intended for criminal research institutions and can be used as a basis and reference for the preservation of digital evidence enabling them to align with business strategies and meet the needs of the institution. This research proposes a framework to continue the preservation of digital evidence, which ensures the better integrity and increases the admissibility of the evidence supported by the techniques of longterm preservation based on the OAIS preservation model.