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VSS fails I keep more than 4 months of shadow copies

I have a shared volume on a guest VM with 2 TB total space and little under 1 TB of free storage.

I enabled shadow copies on that shared volume to run twice a day and the shadow copies are stored on the shared volume and the maximum size is to "No limit".

The problem is, when I keep the shadow copies for more than 3 months approx. , or when the shadow copies used storage goes 100 GB, The VSS fail when a back up job is scheduled to run on my guest VM ( Event viewer error is listed below).

I can temporarily fix this issue by manually deleting old shadow copies that are more than 3-4 month old.

However, I don't understand why the VSS would fail when the shadow copy storage reaches a certain limit even though the shared volume would still have 40-50% of free space

Event ID: 12293

Volume Shadow Copy Service error: Error calling a routine on a Shadow Copy Provider {74600e39-7dc5-4567-a03b-f091d6c7b092}. Routine details PostFinalCommitSnapshots({2a083244-a589-4cd4-8db5-89ea598b9992}, 5) [hr = 0x80070002, The system cannot find the file specified.
].


windows-serverwindows-server-hyper-vwindows-server-2012windows-server-backup
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