While snapshots and Storage Checkpoints both create a point-in-time image of a file system and only the changed data blocks are updated, snapshops and Storage Checkpoint differ in the following ways:
Table: Differences between snapshots and Storage Checkpoints
Storage Checkpoints also serve as the enabling technology for two other Symantec product features: Block-Level Incremental Backups and Storage Rollback, which are used extensively for backing up databases.