The purposes of backup and replication often become blurred due to misuse or misunderstanding of the terms.
A backup is a point in time copy of data that enables recovery in a data loss event and also the ability to recover from an earlier point in time so in the event data is changed or becomes corrupted it can be recovered. Typically backup is enabled via a software product or dedicated hardware appliance. Replication can be a real time or point in time replica of data. In the event of data loss or corruption, data can quickly be brought back online via the replica. Replication if correctly implemented enables a quicker recovery time objective than backup and lower recovery point objective if real time replication is configured. Typically replication is enabled via a software product, built-in application capabilities or via built-in storage mirroring capabilities.