The MSU Institutional Repository, is a great option for depositing data (or documents for that matter) that you either wish to archive or make publicly available. It's not a workspace for ongoing data manipulations. Data deposited to Scholars Junction should be in its final form but you can deposit updated versions each year to comply with the grant.
The Library has a research guide that provides some information about MSU Institutional Repository, including a section with points that you can build into your data management plan.