Do not multiplex any backups that are to be synthesized because it is inefficient. To synthesize multiplexed client images requires multiple passes over the source media - one per client.

Performance issues can also occur if multiple streams are selected for synthesized backups. The issues are similar to those encountered while multiplexing synthesized backups. Back up to disk whenever possible to improve multiple stream performance issues.

Reduce the gap between the last incremental backup and the synthesized backup. Since a synthetic backup does not involve direct contact with the client, a synthetic backup is only as current as the last incremental backup. If there is a concern to reduce a potential gap in backup coverage, run an incremental backup before the synthetic backup.

The option to create multiple copies is allowed for synthetic backups using the multiple copies synthetic backup method.

See Using the multiple copy synthetic backups method.

Synthetic backups are not supported if any of the component images are encrypted.

A user-generated backup cannot be used to generate a synthetic image. A backup that is generated from a User Backup schedule or a User Archive schedule cannot be used as one of the components of a synthetic backup.