I have two Western Digital 6 TB Thunderbolt Drives. Basically each enclosure has two 3 TB drives to make a 6 TB striped raid. Is there a way for each of those raids to mirror one another? I want to edit on one drive and always have an updated backup. Then occasionally update an offsite backup. I was using disk utility to create the raid and it seems it can only create a mirrored raid where a 3 TB drive is mirrored on the additional 3 drives.
How can I make each 6 TB Raid mirror each other in a separate raid?