Transfering Time Machine backup hd from usb to Airport extreme.
I have a usb hd which i use as a time mahine backup. Since purchasing the brand new airport extreme ac i want to move my hd from direct usb to back of the airport extreme. thought it would be a simple process.
i notice my usb hd on my airport extreme, however when i selected it (time machine preference option), it thinks it is a second hd and ask if i wanted two different backups or keep as a single backup location.
i dont want to wait another 10 hours of backup the machine and lose all my historical backups.
any advise?
alex
MacBook Pro, iOS 7.1