I have 2 Promise R6's (got a great deal on them second hand!). I am planning on using the first R6#1 as my main file storage device (all my files on it), with the second R6#2 being a backup of the first R6 (both in RAID 5 mode), meaning: R6#1 (file storage) ==> R6#2 (backup of R6#1) So the big question I need answering is: What is the best solution for backing-up from one R6 to the other R6? (or any other backup set-up suggestions or general set-up ideas anyone can offer to me?). I'm thinking cloning is not the solution, as faults would be copied straight across, and I'm also pretty sure that TimeMachine cannot backup one external to another external? Is there perhaps a utility that can save files to two external drives simultaneously? Some background on my Mac Mini set-up: I have a 2012 Mac Mini (as the boot/apps machine only), which has a 256gb SSD and the OEM Apple 1TB HDD. The SSD has the boot/apps, with the HDD having two partitions 260gb/740gb, with the 260gb part being a clone of the SSD, and the 740gb part being a TimeMachine incremental backup of the SSD. This, I hope, means I can boot from the clone on the HDD if the SSD fails, and/or use the TM backups to reinstate anything (OS/apps/temp files) back to the SSD from the incremental backups it does. This stuff sure gets complicated quickly! Thanks in advance.