briancartledge I think you can create a job, running sometime after the initial job, to backup devices based on the status of the previous backup.
I think you would use the "Last Login Results" as the "Group by:" on the "Choose Nodes" tab of the job. (might need to use the "Dynamic Selection" instead, and then use "Last Login Result" is "XxCriteriaHere")
Then you can select, for example, "Cannot Log into Device:" and/or "Connection Refused by" etc...