Rman Format options

You can use format options with backup commands to specify a location and name for backup pieces

%F - combines database identifier (DBID), day, month, year and sequence number
%U - Specifies a system generated unique filename (default)
%u - specifies an 8 character name
%d - name of database
%s - backup set number
%t - backup set timestamp
%p - piece number within the backup set