Zmanda groups sources by a virtual entity called backup sets. Backup sets offer more scaffolding by creating an isolated data boundary that groups sources, storage, and timing templates together. Thus, even to back up an individual source, you must create a backup set. This framework simplifies backups of 100's of endpoints, where different groups have different backup requirements. For example, on a network that includes servers with a high rate of data change and desktop systems that change data more slowly, you would probably want to create one backup set for the servers and another backup set for the desktops.