Microsoft recommends not to disable the Volume Shadow Copy Service or you will lose System Restore and recovery functionality.
Volume Shadow Copy Service
How can I disable VSS?
It is possible to disable the Volume Shadow Copy Service by using the Microsoft Management Console. However, you should not do this. Disabling VSS adversely affects any software you use that depends on it, such as System Restore and Windows Server Backup.
This is the information provided by Microsoft in the Volume Shadow Copy Services (local) provided in the Component Services Extended tab.
Description: Manages and implements volume Shadow Copies used for backup and other purposes. If this service is stopped, shadow copies will be unavailable for backup and the backup may fail. If this service is disable, any services that explicitly depend on it will fail to start.
By design System Restore
runs in the background and when monitoring is enabled, will automatically create a new restore point every 24 hours (system checkpoints)
. Restore points can also be manually created by the user at any time. When the allotted disk space is reached the oldest restore point will be purged on a first in first out (FIFO) basis. Otherwise, restore points over 90 days are purged automatically in order to keep the volume's usage within the specified amount. All restore points will eventually be deleted after the time specified in the RPLifeInterval registry setting is reached or earlier if allotted disk space is insufficient so it is not possible to create a permanent restore point.Understanding System Restore in Windows 7 (FAQs)Understanding System Restore in Windows Vista (FAQs)Understanding System Restore in Windows XP