There's a lot to be said for complete integration, but who can afford to rip and replace a legacy backup infrastructure? Fortunately, point options can eliminate many pains by providing easier restorations, tighter backup windows and better RPO/RTO; and most enterprise backup software products now embrace disk as a common part of the backup landscape.
The most common methods of integrating disk are D2D, D2D2T and VTL systems. Although they're all disk-to-disk at heart and share a number of similarities, these three technologies serve different purposes.
In D2D, also known as BTD (backup to disk), disk serves as the final destination of a backup data stream, so use of a disk subsystem must be supported by the backup application. This differs from replication in that data is formatted as part of a backup set, and files will usually be restored from the original backup application as if they were stored on tape--only much faster. D2D has experienced a leap in popularity in small office applications, thanks to availability of inexpensive USB and NAS devices that are simple to connect and small enough to take offsite.
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