As the named are greyed-out, could you confirm that the delta backup job saves the backup to remotes srv04-incremental and srv12-incremental, and the mirror backup job copies the backups from srv12-incremental to srv04-incremental? (or at least confirm these are the same couple of remotes)
Also, could you tell me if the VM with which you got the "No new data to upload for this VM" message was backed up by your backup job "Incremental backup every 4 hours - 8 days retention"?

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