Hi @Andy Duffield ,
does this help:
Huge VSS leftover
https://community.spiceworks.com/topic/2257019-huge-vss-leftover
This is also an intersting approach:
From:
How can I delete corrupted Shadow Copy Files?
https://community.spiceworks.com/topic/432568-how-can-i-delete-corrupted-shadow-copy-files
Start an elevated commandline window
Type in wmic and press enter
wmic:root\cli is shown
Type in shadowcopy which will list the current shadow copies
Type in shadowcopy delete and confirm to delete the copies one after the other
To leave the WMI commandline type exit
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Regards
Stoyan Chalakov