I thought that too, but actually, I'm not sure you can.  You can stripe 
multiple mirror or raid sets with zpool create, but I don't see any 
documentation or examples for mirroring a raid set.

However, in this case even if you could, you might not want to.  Creating a 
stripe that way will restrict the speed of the IDE drives:  They will be 
throttled back to the speed of the USB disk.

What I would do instead is create a mirror of the two IDE drives, then use zfs 
send/receive to send regular backups to the USB drive.
 
 
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