Virtual Synthetics and Synthetic Full Backup in NetWorker 8.x

Synthetic Full Backup

NetWorker 8.0 introduced a new backup mode called Synthetic Full Backup, which creates a full backup by merging the most recent full backup with all subsequent incremental backups. This process only involves data exchange between the NetWorker backup server and the Data Domain system.

However, the mode is not fully optimized for Data Domain because it still requires reading the original full backup and all incremental backups, restoring them to a pre‑deduplication state, and then writing a new full backup back to Data Domain. During this write, Data Domain applies inline deduplication again, resulting in low efficiency.

Virtual Synthetics

In NetWorker 8.1, as well as in NetBackup and DD Boost, a new feature called Virtual Synthetics was added to improve Synthetic Full Backup for DD Boost clients. Virtual Synthetics avoid restoring the full backup and all increments; instead, they create the new full backup by adding pointers to existing data. This dramatically speeds up the synthetic backup process. Data Domain uses metadata to synthesize the full backup without moving data over the network, and the Virtual Synthetics option is enabled by default starting with DD Boost OS 5.4.

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