When you grep for the word 'address' in the file </etc/systemd/network/10-eth0.network>, how many rows are seen? Ideally, there should be just one.
Two addresses return, IPv4 and IPv6.
I disabled IPv6 on the VCSA and grep'd the file again to ensure the IPv6 entry is gone (which it was), and the backup completed.
I've been told that disabling IPv6 can mess up patching? Can anyone clarify? If so, is this still a thing in 6.7?
TimR26 - i dont know really about the patching thing, but just a heads up that you will encounter the same exception if you are planning to have multiple static routes configured. We are encountering same exception with backup manager. Till now it appears that there are no workarounds.