A method and apparatus for restoring an updated computer storage from a journal of write events and a copy of an original storage generates an event map from the journal of write events. The event map permits efficient combination of the contents of the write event journal and the original storage. The...http://www.google.de/patents/US6158019?utm_source=gb-gplus-sharePatent US6158019 - System and apparatus for merging a write event journal and an original storage to produce an updated storage using an event map
