Time machine thinks network volume is encrypted when it is not
I created a Time Machine backup of my computer on a networked volume. Then my hard drive in my mac failed, so I replaced the hard drive and reinstalled the operating system. After installing the OS again Time Machine won't recover the files from the backup because it thinks the backup is encrypted. I am pretty sure I never set up encryption on the network volume and this is just a bug.
I have read that using the Time Machine backup appliance you can press a button on the back and temporarily suspend the use of encryption for 5 minutes to allow access to the files on a volume that is encrypted, so it seems like there should be some kind of workaround for a disk that isn't encrypted at all.
Any idea how to recover files from a network backup?
Mac Pro