I'm using Windows Server Backup on a Windows Server 2012 R2 system that has been in production for half a year or so. The server has around 60GB used, and the backup drive is a 160GB external drive [yes, it's small, but will hopefully swap later]. The setup has been working great, and just yesterday when I opened the Windows Server Backup utility, I noticed that all backups have been successful and there were well over 100 backups available. The external drive was low on space, with probably 15GB free or so. But that's fine, since I understand that Windows Server Backup should delete the oldest backup available.
...OR...you know, it deletes everything. So I log in today, and what do you know? 60ish GB used on the external drive, so plenty of free space. But when I checked Windows Server Backup, I only have 1 copy available. Am I missing something? Is that how it's supposed to work when the drive gets full, that it completely wipes all previous backups and creates a new one? I was under the impression it would delete files from the oldest snapshot, or delete several old snapshots, and create a new backup once the drive had enough space freed up.
In my searching before this, I found that some others have had experiences, at least with Server 2008 R2, where Windows Server Backup would all the sudden only keep 1 backup copy, and consistently only ever update 1 copy and not maintain history, as if the retention flag had somehow been set to 1 without the administrator doing anything. So I guess I'll know tomorrow whether or not that's happening to me; whether I see "1 copy available" again, or "2 copies available".
Is this normal behavior? Any way to fix it? Thanks in advance!
:: EDIT ::
So...I checked this morning, and the server is backing up extremely slowly. It usually takes an hour and 15 minutes or so, starting at 2AM. It's 11:17 AM, and it's still backing up.
:: EDIT ::
The backup eventually finished. I still get the odd I/O error on the external drive and I'm planning on replacing the drive. However, I'm still curious of what's caused it to start only keeping a single backup. The only thing I noticed is that the Advanced Options in Windows Server Backup for that backup schedule now shows "VSS Full Backup", where as another server shows "VSS Copy Backup", and that server is maintaining history and each backup says it's a full backup.
So! I'm thinking I need to: •Cancel the backup if it's still running [taking abnormally long] •Delete the backup schedule and 'release' the external drive •Replace the external drive and create a new backup schedule, using the advanced option of VSS Copy Backup.
Can anyone confirm that this will most likely be the solution to get multiple full backup versions going again?