When backing up AppAssure Linux Agents you may recieve and error similar to below:
"Failed to add attached device metadata for '/dev/dm-1'. The child device already added."
Links to fixed build can be found here (Note: You will need to update your core to 5.4.3.*):
Centos / Rhel 6.3 - 6.6
Centos / Rhel 7
SLES 11 SP2- SP3
Ubuntu 12.04 - 14.04