Is a RAID really necessary though? I know the RAID units today are pretty good, but I've had some failures in the past with older systems, and I just stay away from them, because I have less than 1TB of data that I can't afford to lose, and the mirroring doesn't really add a lot of value for my needs.
To keep things simple, I just make redundant copies by pointing Crashplan to multiple targets - the cloud, a single-drive NAS, and an internal hard drive in my desktop dedicated for backups.
I also burn periodic copies of my most critical data to Blu-Rays. Super critical data gets burned to M-Disc Blu-Rays.
I guess that's unproven. M-Disc is supposed to be very reliable.
In any case, it's moot for me. I am regularly rewriting the -entire data set-. I am not doing incrementals, so it is pretty unlikely that I'll ever use my oldest burned discs for recovery.
To keep things simple, I just make redundant copies by pointing Crashplan to multiple targets - the cloud, a single-drive NAS, and an internal hard drive in my desktop dedicated for backups.
I also burn periodic copies of my most critical data to Blu-Rays. Super critical data gets burned to M-Disc Blu-Rays.