I had a situation where
This is a known combination of events that causes this, VMware Knowledge Base
One way to resolve this is to turn off automatic disk optimization in Windows. Do you do this?
Hi,
You can disable it:
How to Disable Automatic Drive Optimization / Defrag in Windows 10 | Password Recovery
or schedule it in less critical moments:
How to disable automatic drive optimization in Windows 10 - gHacks Tech News
ARomeo
Bad idea - as soon as you use snapshots any defragmentation tools running inside the guest will expand the virtual disks.
Correct but Veeam is the most popular VM backup software and it is snapshot based