An incremental backup contains only the data that has changed since the last backup operation (full or incremental). However, this method wouldn't satisfy the requirement of a maximum data loss of 15 minutes without taking backups every 15 minutes, which is often impractical. A full backup includes all data within the system but taking a full backup every 15 minutes is resource-intensive and would likely not meet operational standards for performance. A differential backup contains all changes made since the last full backup, but like the incremental backup, it would require taking backups every 15 minutes to meet the objective. A snapshot, on the other hand, can create a point-in-time copy of data very quickly without the resource overhead of full or differential backups. Incrementing the snapshot every 15 minutes can fulfill the requirement with minimal impact on resources, thus it is the correct answer.