You have a server that runs Windows Server and contains a shared folder named UserData.

In the Administering Windows Server Hybrid Core Infrastructure materials for file services, Microsoft specifies that FSRM is the component designed to enforce space usage limits on shared data: “File Server Resource Manager provides quota management, file screening, and storage reports. You can assign quotas to volumes or specific folders and use templates to standardize limits and notifications.” The guide further notes that you can “configure hard or soft quotas per folder, generate warning e-mails or events as thresholds are reached, and apply automatic quota templates for user home directories.” Because your requirement is to limit the amount of storage space that each user can consume in the UserData share, the supported and least-privilege approach is to apply an FSRM quota on the UserData folder (or on each user’s home subfolder via auto-apply templates). Other options listed do not meet the goal: Storage Spaces manages physical capacity and resiliency, not per-user limits; Work Folders synchronizes user data but does not enforce quotas on a share; DFS Namespaces provides a unified namespace and referrals, not storage consumption control. Therefore, FSRM is the correct tool to enforce per-user or per-folder storage limits on UserData.