@bgareffa it's a 3rd party tool for the Mac OS which works really well :
@bgareffa assuming the one left in the dock for backup is always the backup of your working drive.
@bgareffa Hi Ben, in that scenario we would normally suggest leaving the G-DOCK in JBOD and using chronosync to manage the synching.
@bgareffa them together. It depends if they are working drives.. or just storage..

G-RAID with Thunderbolt