For me, Windows Server Backup (2012) is actually a huge bug itself. Just have a look at my backup history:

Best of all: Every failure gives a nice cryptic error message (without any details), like:
- “There was a failure in creating a directory on the backup storage location.”
- “None of the items included in backup were backed up.”
-
“The specified component was not reported by the VSS writer.”
So far, I haven’t been able to get a reliable backup via Windows Server Backup.
So, until I get this fixed, let’s start with something light:

Take a good look on how the dates are sorted. Nice, isn’t it?
It’s sorted/grouped by Backup target, then by date.
No, if it was sorted by backup target, then “ExtBackup” would be listed at the beginning or the end of the list – not in the middle. It is sorted alphanumerically by the “Backup time” column (as indicated by the sorting arrow).
it’s sorted “alphabetically” by date, so 01/xx/yy comes before 02/zz/kk, whatever xx, yy, zz, kk are (see also 04/12/2012 shown before 22.09.2012, for example, because “04”<"22"). I am currently trying to understand if someone at microsoft is aware of this bug
ps I have found the same thing here:
https://social.technet.microsoft.com/Forums/windowsserver/en-US/249d7fa4-d518-4025-ae14-53643825dcb8/bug-in-windows-server-backup-backup-time-list