as always, start with these 2 guides from cover to cover. Any DBA has no excuse not to.
all you can have RMAN http://www.oracle.com/technology/deploy/availability/htdocs/RMAN_Overview.htm quick guide http://download.oracle.com/docs/cd/B10501_01/server.920/a96564/toc.htm used guide http://download.oracle.com/docs/cd/B10501_01/server.920/a96566/toc.htm
I have also read Robert Freeman's book. It is nice and has some practical perspectives that are insightful
-- //www.freelists.org/webpage/oracle-l
