vssadmin shadowstorage is a command used in Windows operating systems to manage the storage space allocated for Volume Shadow Copy Service (VSS). VSS enables users to create backup copies or snapshots of their data, even while files are in use. The shadowstorage command allows administrators to configure and manage the amount of disk space reserved for these snapshots, ensuring that system restore points and backup copies do not consume excessive storage.

I ran into an issues today with one of our clients backup not running properly. After checking the log – “There is not enough space on the volume where the snapshot storage is located.” This log is a bit misleading. I’ve tried to clean up the hard disk a bit using space mongo. Re run the backup and it failed again.

After some digging, I ended up running a command – vssadmin list shadowstorage –

I get the results Maximum shadow copy storage space: 100%.

Did some more digging and microsoft recommend this command –

vssadmin resize shadowstorage /For=C: /On=C: /MaxSize=20%

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