TimeMachine on multiple (smaller) disks ?
I just bought this ginormous 8TB Western Digital My Book RAID drive.
I loaded and restored my system to this drive and am booting to it, works great.
Now, I want to set up TimeMachine to back it up, and I have 2 4TB WD My Book Pro drives to use.
I can add both the 4TB drives to TimeMachine, but when I start the backup TimeMachine bails and
says it cannot backup because there is too much data on the 8TB to back up to a single 4TB drive
even though it has two 4TB drives to backup too.
This is confusing since my reading of this on the net says that it will place backup data wherever
it can using multiple disks ... so as long as the sum of the space on the TimeMachine disks is
greater than the backup dataset one would think this would work.
But it does not seem to.
Is there a trick to this, or somewhere in the docs that says I cannot really do this, that any
single backup disk must be bigger than the data I want to backup? What is the truth here?
Thanks.
iMac, OS X Mountain Lion (10.8.2), 24 inch