 long-term preservation. The repository should 
maintain a system that is scalable (e.g., able to handle anticipated future volumes of both 
bytes and files) without a major disruption of the system. The repository should maintain a 
system that is evolvable. That is, the system should be designed in such a way that major 
components of the system can be replaced with newer technologies without major disruption 
of the system as a whole. The repository system should be extensible. That is, the system 
shoul