Change old backup destination
As I understand, Time Machine backup is cumulative.
My iMac has a 1Tb disk and two extra 1Tb attached, one USB, one Firewire.
I want to setup TM to backup to the USB disk in a way I have exactly the same content in both disks, internal and external (bootable from USB?) and set old flie versions stored in the Firewire disk, not on the same USB disk.
Is that possible?
iMac, OS X Mountain Lion (10.8.2)