A snapshot group is a collection of point-in-time snapshot images of a single associated base volume.
System Manager organizes snapshot images into snapshot groups. Snapshot groups require no user action, but you can adjust reserved capacity on a snapshot group at any time. Additionally, you might be prompted to create reserved capacity when the following conditions are met:
Any time you take a snapshot of a base volume that does not yet have a snapshot group, System Manager automatically creates a snapshot group. This creates reserved capacity for the base volume that is used to store subsequent snapshot images.
Any time you create a snapshot schedule for a base volume, System Manager automatically creates a snapshot group.