The basic function that they perform is that of providing automatic concurrent backup of all activity on designated logical drives. In the event of drive failure, the user is given the option to continue without backup. The scope of the products is different in the following ways. Logical drives must be local. This product is typically used with external storage devices.
Logical drives can be either local or network drives.
Logical drives can be either local or network drives. It creates an exact copy of a logical drive and verifies that it is exact.