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TechQs-1081 avatar image
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TechQs-1081 asked LimitlessTechnology-2700 answered

Server 2019 backup not maintaining correct number of copies

We have two external drives that we backup to and swap daily (one staying offline at all times). We upgraded from 2016 Essentials to 2019 Standard a few months ago. For whatever reason, one of our backup drives will only have at most about 14 copies available... once it hits that it will drop down to about 5 and then back up to about 14.

The other drive has 130+ copies available. We've reset the configurations a few times and they're identical, the drives themselves are identical (NTFS).

Screenshots attached, any ideas would be really appreciated!

132427-backup-1-not-working.png


132417-backup-2-working.png


windows-serverwindows-server-2019windows-server-backup
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yagmoth555 avatar image
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yagmoth555 answered

Hi

At first I would try to reformat and reactivate the disk that fail with wbadmin as it seem related to that disk.

If you do it via the commandline;

wbadmin get disks > C:\disks.txt
-- Find the correct disk ID of the fail disk from inside.
wbadmin enable backup -addtarget:{xxxx}
Answer Y to enable it.
Answer Y to format it.


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LimitlessTechnology-2700 avatar image
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LimitlessTechnology-2700 answered

Hello TechQs

That reminds me to something I have experienced. Assuming that you have already checked the drive and the Event Viewer is free from I/O errors, the issue might be that the assigned space for the Volume Shadow Service for the specific drive (in the drive properties) was set way too low. After increasing that amount the backup has created several copies and we could now restore more than just a single day.

You can check the size by volume with:

vssadmin List ShadowStorage

then verify that the bad drive has the same size as the healthy drive. To resize use> vssadmin Resize ShadowStorage /On=[drive]: /For=[drive]: /Maxsize=[size]

Hope this helps in your case too,
Best regards,

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