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ReadyNAS OS provides both file backups, just called backups, and snapshot backups, called ReadyDR backups. Both operate similarly and both provide copies of your data, but because of the underlying differences, depending on what you are backing up and why, one might be better than the other for your specific case.
A file backup is a copy of the file that exists at the time of the backup. The backup contains no history of the file (although you can maintain file history by maintaining older backups.) A ReadyDR backup consists of all of the snapshots on a share or LUN. You have the same snapshot history in the ReadyDR backup as you do in the original. You can retrieve previous versions of a file in the same way you can retrieve previous versions through the original snapshots.