https://docs.oracle.com/cd/E11882_01/backup.112/e10643/rcmsynta007.htm#RCMRF107 A is incorrect - zdlra backups are sbt backups but not written to tape always E is incorrect - Not all are supported B If the media manager cannot proxy copy the file, then RMAN backs up the file as if the PROXY option had not been used From: https://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmcncpt.htm#BRADV89487