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Asynchronous replication is a data storage backup technique where data is not immediately backed up during or immediately after the primary storage acknowledges write complete, but rather done over a period of time. This method results in a system with good performance and lesser bandwidth requirement, but the backups are not immediately available if something happens to the primary storage.
In an asynchronous replication backup system, the data is written to the primary storage first, then depending on the settings and the type of implementation, replicates the data into a separate remote storage medium like magnetic tape or high-density disks. The copying or replication is done in predetermined intervals.
This method allows for good performance without taking a hit to bandwidth usage as data is not replicated to remote backups in real-time, as in a synchronous replication method. Data is only backed up after predetermined times. This does not guarantee 100% backup, so it should be used for less sensitive data or information that has tolerance for loss.