An apparatus and method for mirroring data is provided wherein integrity of data on a mirror device is maintained during and after a restore process of data to a standard volume. Because integrity of the mirror is maintained, data from the mirror may be used to perform a later restore to the standard...http://www.google.de/patents/US7149787?utm_source=gb-gplus-sharePatent US7149787 - Apparatus and method for mirroring and restoring data
