The Flash recovery area is a disk destination that is used by Oracle as a storage location for all recovery- and fault tolerance-related files.
RMAN will use it as a default location for backups. Remember that the flash recovery area is not only intended for RMAN’s exclusive use;
it is also, typically, used for multiplexed online logs, for a control file copy and as an archive log destination.
The advantage of directing RMAN backups to the flash recovery area is that Oracle can manage space in the recovery area very effectively: when it fills up,
Oracle will automatically delete any files within it that are obsolete, according to whatever rules for obsolescence you establish.
