Open a command prompt and type the following

vssadmin list shadowstorage

The below will be displayed.

C:\Users\User>vssadmin list shadowstorage

Shadow Copy Storage association

For volume: (D:)\\?\Volume{ }\

Shadow Copy Storage volume: (D:)\\?\Volume{}\

Used Shadow Copy Storage space: 58.9 GB (3%)

Allocated Shadow Copy Storage space: 61.7 GB (4%)

Maximum Shadow Copy Storage space: 100 GB (6%)

The following command limits the size that VSS can use.

vssadmin resize shadowstorage /for=C: /on=C: /maxsize=50GB