@Chris I also would like this kind of feature.
My problem is that I have a bunch of VMs (100,101) which rely on an exported drive from an LXC container (102, which runs an NFS server). The backup job backs up the LXC 102 last, and so the connection to the NFS drive in the VMs 100 and 101 is lost during the backup of 102, and is never automatically reconnected.
How can I fix this?