If I wanted to mirror my 3 HD's with 5 Partitions onto one External...

[BiikeMike]

I have three Hard Drives installed in my Mac Pro. The original one, and two aftermarket. They total around 850 GiB.

I have them divvied up into 5 partitions. If I wanted to Mirror them onto ONE external 1TiB Drive, what are my options? Is it a backup only type of thing, or are there options to do a real time mirror like RAID-1?

 

[Sean Dempsey]

Partition the external into 5 sections that are the same size as the drives and you could do it.

Or, you could schedule Carbon Copy Cloner tasks to run every night and just copy them over. It's not a raid 1, but that's how I'd do it.