Quote Originally Posted by getnami View Post
...This way we will get rid of the /arc partition getting filled.
As pointed out by previous posts your #1 problem is not the "/arc partition" but that in case of a disaster you have no way to restore/recover your database.

Design your backup strategy based on database criticality and business needs a.k.a. how much data is the business willing to lose in case of a catastrophic event.

RMAN is a great tool.