A copy procedure detects qualified data objects in a body of source data, and copies the source data to a target storage unit except for unqualified data objects, which are replaced with a prescribed bit pattern. Following completion of the backup, a record is prepared indicating that all data objects...http://www.google.de/patents/US6941328?utm_source=gb-gplus-sharePatent US6941328 - Copy process substituting compressible bit pattern for any unqualified data objects
