Is this db backup approach adequate?

A question on a db backup approach to see if it is adequate.
I have a 11g database that has FRA on file system (/data/fra), not on ASM. The file system /data is backed up to tape nightly through the OS backup job. The archivelog destination is the FRA (which is the default when the db uses FRA).
Is it correct to say that since the archived logs are written to the FRA, and the FRA is backed up to tape daily, there is no need to explicitly backup the archivelogs through RMAN?
That is, I just need to create a job to backup the database files and control file to FRA? (And the db backup copies and the archived logs in the FRA are backed up to tape by the OS job).
Just wonder if there are drawbacks of this approach? Would it cause any potential problem with db restore/recovery?
Since the archivedlogs are not explicitly backed up by RMAN here, would the backup retention policy and the archivelog deletion policy set in RMAN be applied to the archivelogs? (If not I would need to have a job to regularly delete old archivelogs).
Many thanks.

if you do not use RMAN to BACKUP ARCHIVELOG, the RETENTION POLICY is not applied. When you manually purge archivelogs, it would still be good to add CROSSCHECK ARCHIVELOG ALL and DELETE EXPIRED ARCHIVELOG ALL to your RMAN commands.
When you use the OS to backup the FRA, it might backup the last [few] archivelog[s] as incomplete files if ARCH is writing to the FRA when it is backed up. On RECOVERy, these ArchiveLogs would appear as corrupt.
In the old days, when using OS scripts to backup archivelogs, I would add "intelligence" into the scripts to ensure that the last archivelog or archivelog still being actively written is not backed up.
RMAN makes backups of only completed archivelogs.
Hemant K Chitale
Edited by: Hemant K Chitale on Sep 27, 2011 10:53 AM

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