Many established repositories have built-in mechanisms to maintain data integrity and discoverability, making it easier for researchers to maintain data they might need to share with collaborators or colleagues. Most importantly, established data repositories are able to issue of permanent identifier links (like Digital Object Identifiers, or DOIs), commonly used for improving discoverability and citing journal articles.
Repositories allow researchers to include metadata describing appropriate uses for the deposited data and include metrics that researchers can use to monitor reuse of the data. Repositories also minimize the burden on faculty and researchers for data sharing requests by allowing researchers to directly link deposited data with their publications, instead of relying on formal requests.
Finally, there are specialized data repositories built for protected data, allowing researchers to privately store and control access to sensitive data. This ensures data can be stored with the appropriate security protocols further minimizing the security burden on long-term storage of protected data.