My goal is the following: use my iMac as a TimeMachine Server (under OS X Lion Server) to backup my MBP via the network.
What I did is to choose, in the TimeMachine Server configuration, the internal drive (1TB) of the iMac as a target for the backup.
However I would like to have redundancy, not for the whole iMac data, but for that backup.
If I backup the sparsebundle created on my iMac (using CCC for example), then I'll have to copy the entire content all the time.
So would it be possible to create a virtual RAID 1 drive whose two drives are two sparsebundles, one located on the iMac internal drive and the other one on an external drive.
I think that would be a very interesting solution for what I want to do, and it would be possible to scale it for 3 drives.