Double-Take also provides timely server and application failover. The core of NSI Software technology is its patented real-time file delta replication. For example, once a mirror of a large database file has completed, Double-Take then replicates only the changes within the file as they occur. This significantly reduces the amount of time and bandwidth necessary to transmit the data. Local High Availability Double-Take can be configured to provide local server and application fault tolerance.
Critical data is identified on a source server and mirrored to a target server.
Replication of subsequent changes can take place on either a real-time or scheduled basis. Both mirroring and replication can be sent over a public or dedicated network link. During failover, the IP address, computer name, and data share points of the source server are transferred to the target server. Its highly efficient byte-level replication dramatically reduces network load, effectively allowing replication of critical data over slower remote links that would otherwise be impractical, if not impossible, to use. For remote replication, bandwidth throttling allows bandwidth utilization to be limited to designated levels to balance the replication with other remote network traffic.