If I had a system with one drive with FreeNAS installed, and two other drives in software RAID 1; if I formatted and reinstalled FreeNAS, would it pick up the RAID array and all the content on it.
So in theory I could set everything up, then save a back up of the config file; and if the system drive (not one of the drives in the array) was to die, I could just replace it, reinstall FreeNAS and update with the config file from months ago; and it would find the array and carry of as if nothing had happened.
yup exactly like that you restore the config file and everything goes to the way you had it at the time of backup, all drive setups, mount points, usernames passwords, everything