Currently, you can only retry an entire job. Every failed VM in the job is backed up again, which is great in most situations.
However, I'd like to be able to retry just a single VM backup from the job, rather than the whole job. For example, if I have a job with 50 VMs and the whole job failed overnight due to some issue, I wouldn't have backup windows big enough to run the whole job again, but it would be nice to select a few critical VMs to back up manually the next morning.
Also, the ability to retry a VM backup that completed with a warning would be useful. For example, if SQL logs fail to truncate a warning is given, but the job doesn't fail. To avoid SQL logs from filling up, it would be useful to retry that VM backup again.
Actually, now that I think about it, it would probably great if you could retry any individual VM from a previous backup, including those that completed successfully.