Every student and employee at CMU has access to cloud-based storage through OneDrive for Business. OneDrive can be access through any web browser from any computer or through a sync client that can be used to automatically sync a location on your computer—much like many people are accustomed to doing already through Dropbox or Google Drive. If you're looking for an easy way to collaborate with your peers and colleagues, OneDrive is probably a great fit for you.
Commonly referred to as a “CAB share” or “department share,” CAB storage is network-based storage hosted and managed by CMU. They are traditional “fileshares” and are usually granted to offices or departments, with access locked down only for departmental use.