Asynchronous data replication

Definition
Asynchronous data replication is

"[a] process for copying data from one source to another while the application processing continues; an acknowledgement of the receipt of data at the copy location is not required for processing to continue. Consequently, the content of databases stored in alternate facilities may differ from those at the original storage site, and copies of data may not contain current information at the time of a disruption in processing as a result of the time (in fractions of a second) required to transmit the data over a communications network to the alternate facility. This technology is typically used to transfer data over greater distances than that allowed with synchronous data replication."