Using premium backup and recovery services : Local Storage Tool : About the Local Storage Tool
 
About the Local Storage Tool
The Local Storage Tool allows you to save copies of the backup files to a local storage location. If a restore is needed, the file can be quickly restored at LAN speed from the local environment without connecting through the IP WAN to DS-System.
NOTE:  Local storage does not apply during the initial backup process. Any backup sets configured for local storage will ignore the setting until the initial backup is transferred to the DS-System online storage.
When a file in a backup set configured with local storage is created or modified, the backup process sends it to both DS-System and the local storage. If a file was previously backed up on DS-System, but there is no copy of the file on the local storage (for example, it was backed up before the backup set was marked for local storage), the backup process sends it only to local storage. If for some reason the file cannot be saved locally, it is still sent to the DS-System and an error is logged.
Local storage behaves differently for backup sets assigned to a retention rule:
• Without Retention — Local storage keeps a copy of the latest generation of the backup set files (as well as online, offsite at the DS-System).
• With Retention — The same number of generations are backed up to local storage as are on DS-System. Ensure there is enough space in the Local Storage, and perform the “Enforce Retention” process regularly. For more information, see “Using premium backup and recovery services”.
NOTE:  In both cases, when a new backup session occurs and an existing generation of a file is replaced by a new one, the old generation of the file is deleted after the new one is saved on the local storage. This means there must be enough free space on the local storage to accommodate both generations.
The Set Properties Options tab offers the following options:
• Save on Local Storage — Enables local storage for the backup set.
• Transmission cache on Local Storage — See “About the local storage cache”.
By default, DS-Client tries to restore from local storage first. For missing files or older generations, DS-Client retrieves them from DS-System online storage. For more information, follow from “Selecting the backup set”.