Reading this:
https://www.ovirt.org/documentation/self-hosted/chap-Backing_up_and_Resto...
It says the node must be in maintenance mode.
I was having a discussion on IRC & they were using this (see link) to backup, it makes
no mention of maint mode
https://scottlinux.com/2015/08/20/create-daily-rhevm-backups/
https://access.redhat.com/solutions/797463
Question: must the node be in maint mode before engine is backed up?