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There is no RMAN vs BCV because they are different products, despite the name "backup" they do different thing.
* Backup Incremental
* Backup to TAPE/Disk
* Duplicate/Restore Database excluding Tablespaces
* Recovery at Block Level
* Restore at Tablespace/Datafile Level
* Recovery Point in time
* and so on
I have no knowledge on BCV, but I know FlashCopy (IBM) that are similar tools.
As far as I understood BCV do mirror images of active volumes. So, If you corrupt block on Production volumes that can be replicated to Backup Site. There is a big difference between BACKUP DATABASE and BACKUP VOLUMES/LUNS. You must be aware of that.
You can combine both technologies do not exclude or put one against the other.
See how these technologies are used.
Invite a seller's EMC so you can better understand the technologies and their implementation.