During the restore of data using VSS Snapshots it deleted all the snapshots, this event was written in the system log :
The shadow copies of volume D: were deleted because the shadow copy storage could not grow in time. Consider reducing the IO load on the system or choose a shadow copy storage volume that is not being shadow copied.
It only restored 20 GB of data and there should be plenty of space in the Shadow copy storage
Used Shadow Copy Storage space: 2.692 GB (0%)
Allocated Shadow Copy Storage space: 5.397 GB (0%)
Maximum Shadow Copy Storage space: 694.752 GB (18%)
When there isn't enough space it should start to delete the oldest snapshots to free up additional space, but it deletedall the snapshots. The problem is the IO but how to prevent this from happening again?