Here are steps to resolve LVM/MD configuration error in Remote Backup
1) log in to the client-server
2) cat /etc/lvm/lvm.conf | grep unit
If the output is:
# Default value for –units argument.
units = “r”
Then:
3)vi /etc/lvm/lvm.conf
4)/units
5)go to insert mode
6)unit=r changes to unit=h
7):wq
8)go to policy—->select backup now option.