Oracle recommends that you use RMAN to back up files managed by Oracle ASM. The procedures for using RMAN are documented in Oracle Database 2 Day DBA.
You can also back up your Oracle ASM managed files by performing a files related operation using the following procedures:
For information about migrating data with RMAN, see Performing Oracle ASM Data Migration with RMAN.
See Also:
For additional information about RMAN, refer to the Oracle Database Backup and Recovery User's Guide.