So we had an issue when half of our Domain Controllers in an environment failed with the Windows Backup (System State). All servers were installed the same way. The backup location is a dedicated disk on the server. The Backups was working when it was setup and the suddenly started to fail. Even if you try to manually backup.
In the Backup Console we see that the backups failed due to lack of space on the backup disk. Its like that the backups were not automatically removed when there is not enough space.
Since Windows Backup uses Volume Shadow Copy in the background, so lets look if we can see anything there.
vssadmin list shadowstorage
OK. We see that on the backup-drive there is a Maximum storage space. That it not right. It should be unlimited. So lets change that. Notice the “For volume” and “Shadow Copy Storage volume”, their names are in between the first parentheses. Highlighted below
Then we change the MaxSize.
vssadmin resize shadowstorage /For=\\?\Volume{bf70cbb8-ea25-40d0-bd9a-6884eb9cfffc}\ /On=\\?\Volume{bf70cbb8-ea25-40d0-bd9a-6884eb9cfffc}\ /MaxSize=UNBOUNDED
and when we check we see that the settings has been made
and if we test a manual backup it works
