Working with backup sets : Email message backup sets (Windows) : Restoring an Email message backup set (DS-MLR) : Specifying performance options
 
Specifying performance options
Special performance options on the Select restore performance options page are intended for large backup sets in high performance environments.
For typical use, keep DS-Client’s default settings, and then click Next to proceed to the next dialog box.
More information in F1 help, see "Select Restore Performance Options (Windows DS-Client)".